How Does A Vacuum Petcock Work

Or, you can restore your stock motorcycle's petcock with our petcock rebuild kits and gaskets. With the vent port closed how does that work having it capped / is the vent port used like a fuel pump when working? Did it let air in. After discovering a diaphragm problem on my NV400 petcock, resulting in a high rpm misfire, I have decided to turn it into a manual type by removing the pressure spring. When a spree has been stored for a long period the vacuum shutoff valve (or petcock) often sticks shut and will not allow fuel to flow even under vacuum. So got a bona fide vacuum hose and got the vacuum right. PETMAX is a Coal Fired Boiler, the next generation PETCOCK fired boilers from BALKRISHNA, are designed to provide low cost heating with fuel efficiency as high as 76 %. Building A Model Boiler - A Laymans Guide To … 2019-3-11 · A small sample of some of our work. Unless someone put an aftermarket petcock on the bike, is that possible? Does the petcock still have fuel AND vacuum lines hooked to it? FLoat needles can sometimes leak a little, but shouldn't be enough to flood everything with gas. Any know why my front cylinder keeps filling up w gas??? Carbs have been rebuilt twice. I am having issues with my petcock but only when I let the gasoline get near the bottom and then switch it to reserves. Open your hood and find your antifreeze reservoir. If you suck gently and no fuel flows, it's bad. If you had a vacuum guage hooked up you would see what I am talking about. can i use a manual petcock valve in place of a vaccuming petcock, can you take out vacuum plunger on a cab and gravity feed fuel to it and make it run, cheap vacuum petcock, convert vacuum petcock to gravity, convert vacuum petcock to manual, how does a vacuum petcock work, how to gravity feed motorcycle carbs, is it ok to disable vacuum petcock,. OEM will work but it is a vacuum operated petcock and the diaphragm can fail causing the contents of your gas tank to be emptied into your carb and then into your engine (which is not good). Hi there i had the same issue with my 1200 trophy a standard fuel tap wont work as it dosnt provide enough fuel on hard acceleration as the petcock pumps the fuel , try running it on pre as this is free flow setting for priming the carbs other wise you can get a seal and diaphragm kit for the petcock which solves the issue. The 1987 fuel petcock (PN 16950-ML8-601) is definitely a different part than the fuel petcock (PN 16950-MG9-005) for a 1984, 1985, or 1986 GL1200. It usually has 2 or 3 setting (a few have 4). If you have noisy radiator problems, this can be due to lots of air getting into the system, this may be due to a number of issues, one of the main issues may be down to the central heating system needing a power flush or the pump pulling in air from the expansion pipe. As requested, here is the nipple on the right carb where the petcock vacuum should connect. It has at least three positions: ON, OFF, and RESERVE. I did however have a big air bubble with old screen that i had to work out of the line by moving the line around until the bubble went up into the tank. Leaks in the air or vacuum lines can cause problems too. When you start the quad by turning over the engine a vacuum is created in the carb which is piped to the petcock via a rubber hose. Tested side-by-side with an oven bag in two solar funnels, the HDPE bag worked just as. I don't have a good way to drain the carbs when I'm at work, and I'm too lazy to do it at home every time I ride. I didn't even know vacuum petcocks had a reserve. A Vacuum driven (PRI/ON/RES) works the same way in PRI (prime. My PO had purchased a rebuild kit but didn't do a good job, and so I had a leaky petcock with an in-line ON/OFF valve installed. If there's vacuum (engine is on), gas flows, if there's not (engine off) gas doesn't flow. With higher vacuum, the switch closes, connecting the ignition module lead to ground. This can mimic vapor lock conditions. A leaking petcock is a dangerous petcock. Vacuum nipple under Carb 1 to the petcock vacuum port; vacuum nipple under Carb 2 to the fuel pump vacuum port. ) REASSEMBLY TIP: When you put the vacuum check valve and vacuum nipple back in the diaphragm cover (if you took it apart,) put a dab of RTV on the threads of the nipple just in case. fix the leak because it won't open up all the way and allow full fuel flow to the carb. Also replace the two small O-rings on the bolts for the petcock part# 92022. It needs the engine to be running, creating a vacuum and the petcock vacuum operated section has to be working in order for the gas to flow. Simparica is a great tasting chewable tablet given orally once a month. I simply removed the o-ring from the vacuum actuated needle in the petcock so that fuel could flow around it while it rested permanently in the fuel-off position. These petcocks have three. If you have overflow on a running bike (and it's not inhaling fuel through the petcock diaphragm via the petcock vacuum line) then there's a problem with the inlet valve. One allows free flow. what are some things like sounds or feels of that bike that can let me know for sure that the vaccums arent working. Our Petcock air bleeder valve is made of brass. the fuel tank could be lower than the carbs, making a fuel pump necessary. How Equilibar Vacuum Regulators Work The Equilibar Vacuum Regulator is a unique type of 2-stage vacuum regulator. hope that helps, Steve. The VOES is a normally open switch. After riding about 150 miles the other day and putting the bike back in the garage I noticed an obvious smell of leaking gas the following morning. Genuine Kawasaki Part- On- Off and Reserve settings. It uses engine vacuum createdwhen the engine is running to pull back a small piston that allows the fuel to flow. The drop in air pressure creates suction on the fuel pipe (right), drawing in fuel (orange). How Does a Motorcycle Work? Fuel Petcock Valve. It seems like the vacuum signal from the carb is what keeps the petcock open, when the motor dies, the valve closes, thus shutting off the fuel supply. The number of tools at an automotive technician’s disposal is truly amazing. If it sticks to the metal pieces, and it likely will, use your fingers to gently work it off. The vacuum valve does not shut off the fuel supply, and inexplicably the tap has no "OFF" position. from the largest online selection at eBay. Tank rubber gasket is included. Xr400 carburetor size. This means that they have a little diaphragm and valve set-up in them which responds to engine vacuum and allows fuel to flow only when the engine is running and supplying vacuum. Leaking Vacuum Lines make it sporadic. 5) Install your fuel line back onto the petcock along with the manual shutoff. why use vacuum petcock 18 Apr 2007 12:29 #131578. Vacuum line from #1 cylinder goes to petcock Vacuum line from #2 cylinder goes to the highest port on top of fuel pump on the right side (in all sincerity it doesn't matter if you mix these up as it vacuum pulses either way, it just makes for a cleaner look as hoses don't criss cross over each other). 4 – Hook up your vacuum gauges and secure the hoses with zip ties to ensure no leaks. Socket options alone can span pages and pages of a tool catalog. To remove the fuel tank, remove the bolt from the rear of the tank and stick a block of wood under it to hold the tank up while you remove the fuel and vacuum lines from the petcock assembly. How does the "reserve tank" work? A common misconception among new riders is that there is a "reserve tank" on a motorcycle which is actually a separate tank from the main tank. Sucking on the line is one way to do this (but make sure it's the vacuum line, not the gas line if you try this!). 2199 Wish Lists Contact Us. Petcock Service (Non Vacuum Style) Tools Needed: Bucket, funnel, URAL Pin wrench, screwdriver and thread compound. Removing the Petcock. Where is the petcock leaking? If it’s leaking through the fuel or vacuum lines it might be because the part marked #19 (Kawasaki part number 11009-1194) in the diagram below commonly fails. How does the petcock wo- question about Vacuums. A petcock is simply the fuel valve that allows you to turn on or shut off the flow of gasoline from your gas tank to your carburetor. The new uncompressed gaskets also add to the problem. If there's vacuum (engine is on), gas flows, if there's not (engine off) gas doesn't flow. I agree the petcock is likely your problem. My OEM petcock was leaking vacuum at the hose itself-where the vac hose was clamped at the petcock. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. I called my local H-D dealer and asked to order it. Do not forget to: connect petcock vacuum hose to left carb. Scooter Professor. On dirt-only models it is important to remember to manually place the fuel petcock to the OFF position after shutting down the engine. The valve can be opened only when a vacuum is created in the system, which means that the fuel flows only when the engine is running. After riding about 150 miles the other day and putting the bike back in the garage I noticed an obvious smell of leaking gas the following morning. The throttle (green) is a valve that swivels to open or close the pipe. PETMAX is a Coal Fired Boiler, the next generation PETCOCK fired boilers from BALKRISHNA, are designed to provide low cost heating with fuel efficiency as high as 76 %. Inspect the vacuum hose if the vacuum petcock fails to operate. If you suck gently and no fuel flows, it's bad. Checkout View cart. We have gravity feed (no-vacuum type) petcock assemblies and left- and right-hand stock-type petcocks. Vacuums - Lost insruction manual for my 6. Hook up a vacuum line between the petcock and the hand-actuated vacuum pump. The vacuum diaphragm is most likely bad and needs replaced. This is a manual activated petcock which eliminates the vacuum petcock that most models are equipped with from the factory. The old 250 and 300 quadrunners were bad about when the diaphragm in the petcock would go bad, gas would run through the vacuum hose witch is on the front side of the carb and would fill the crankcase with gas. The carb dip shown will dissolve this rubber part. It would just churn endlessly. I agree the petcock is likely your problem. Removing the Petcock. If I can trust the vacuum petcock to work, then I will have less concern. A leaking petcock is a dangerous petcock. replacing petcock just remove and install a new one? I didn't have a bike with a vacuum petcock until my 83 Interceptor! yes the yamaha unit will work on. It seems like the vacuum signal from the carb is what keeps the petcock open, when the motor dies, the valve closes, thus shutting off the fuel supply. The above test should also work when the petcock is in the RESERVE position. Is the GT750 petcock vacuum shutoff system an improvement on the original RE5 petcock? If so, I'll happily swap mine out. there are 4 lines going to the shutoff. I guess the way he did it works as well. This valve helps to relieve pressure that builds up inside the filter. Xr400 carburetor size. If you run the bike out of gas, or if you take the carbs off for cleaning, then the bowls will be dry, and you need vacuum from the engine to open up the petcock for fuel to fill the carb bowls. I'd try a better quality petcock before going to a electric pump. A typical manual petcock utilizes a ball valve construction, which limits the use of the tap to simple “on” and “off” applications. On is what you use normally…. Made in USA. You have no items in your shopping cart. WARNING: Motor vehicles contain fuel, oils and. The 1987 fuel petcock (PN 16950-ML8-601) is definitely a different part than the fuel petcock (PN 16950-MG9-005) for a 1984, 1985, or 1986 GL1200. After finally stopping a leaky fuel petcock I thought I'd tell others in case they have they same frustrating problem. Ok, So The Carbs are pulled back. If gas comes out, then keep moving on. Anyone have or know where to find the details on how to convert the OEM petcock from vacuum operated to manual?. 3/8" Pipe Thread with wing nut. It will generally start right up and either work for a few minutes or bog every few seconds. Three possible petcock settings - long arm left long arm right long arm down Two of these setting do not allow fuel from tank without vacuum hooked up and engine running. This petcock *might* be similar or identical to the XV535, or other bikes of the same vintage. It is used to replace the engine vacuum operated petcock. You can check at a auto supply for a petcock, or a motorcycle shop, scooter dealers also would be a good place to look. The VOES is a normally open switch. Vacuum only operates the ON/OFF function. Depending on the size of your pump, there is a lot you can do with this. When the engine vacuum is applied to the valve, fuel should flow. I agree the petcock is likely your problem. Instructions for OEM Petcock conversion from vacuum to manual? « on: July 05, 2010, 05:22:40 PM » I know I've seen it on here before and I thought I saved it but can't find it now. There's no Off because the petcock is vacuum driven, meaning if the engine isn't running, there is no vacuum, so the petcock is off, it doesn't need a setting for that. I wonder how many "leaking" petcocks out there are due to a simple obstruction of the leakback feature in this check valve. Most vehicles have a radiator drain petcock on the lower corner of the radiator. Replaced with a new stock petcock with the vacuum disconnected. Contact your IPEG representative to learn more about which pressure/vacuum relief valve would work best for your application. With the vent port closed how does that work having it capped / is the vent port used like a fuel pump when working? Did it let air in. Most bikes that I owned (all of them Japanese) had 3 ON/RES/PRI ON - when is ON it allows t. You can use a fluid syringe to produce vacuum in the line. Re: Vacuum petcock on SV. replacing petcock just remove and install a new one? I didn't have a bike with a vacuum petcock until my 83 Interceptor! yes the yamaha unit will work on. 0) that I am working on flushing the coolant. But once you know how to can chicken you can take advantage of their great prices — or those at your favorite bulk stores — without wondering what to do with it all. Drain the vehicle's coolant into the coolant drain bucket by opening the radiator's drain petcock or by removing the lower radiator hose. When this is cut you need to close off the vent and vacuum port by connecting the two ports with a hose or sealing these off with J-B Weld (or a similar product). Anyone have or know where to find the details on how to convert the OEM petcock from vacuum operated to manual?. You can test it by taking a turkey-baster, connect it to the vacuum line and draw a vacuum on the line with the turkey-baster (or an actual vacuum tester). When the engine vacuum is applied to the valve, fuel should flow. But once you know how to can chicken you can take advantage of their great prices — or those at your favorite bulk stores — without wondering what to do with it all. Your replacement manual petcocks say "must be turned off if the bike sits for more than a few hours". How does a frost free valve work? Newer frost - free sillcocks are designed such that the shut-off valve is located about 8 to 12 inches inside the sillcock pipe. Can anyone please tell me which is the best, the manual or the vacuum petcock? My bike was originally fitted with a vacuum but I have changed the tank and the new tank has a manual. Thanks for this - I'm about to do the same on my '79 XS650. The VTX1300 is a Honda line of cruiser class motorcycle that was created as a smaller but easier to handle version of the VTX1800 (VTX stands for 'V-Twin eXtreme'). If water inside the assembly should freeze, damage to the assembly and the system may occur. Petcock - Non Vacuum Type to Replace 1978-84 Vacuum Type Petcocks. I think in the meantime I'm going to install an in line shut-off valve for the fuel so I don't blow my garage up, and burn down my house. The valve can be opened only when a vacuum is created in the system, which means that the fuel flows only when the engine is running. After riding about 150 miles the other day and putting the bike back in the garage I noticed an obvious smell of leaking gas the following morning. 65mm from tank mount to lowest point. This valve helps to relieve pressure that builds up inside the filter. That is probably why there is no off position. Unless someone put an aftermarket petcock on the bike, is that possible? Does the petcock still have fuel AND vacuum lines hooked to it? FLoat needles can sometimes leak a little, but shouldn't be enough to flood everything with gas. i could see that if diagfram is bad in petcock it will let gas through that end. This means that they have a little diaphragm and valve set-up in them which responds to engine vacuum and allows fuel to flow only when the engine is running and supplying vacuum. I thought having 10 would be a lifetime supply, but no, between leaky ones, ones that the stupid lever froze on and broke off ect, I finally abandoned them all in favor of the vacuum setup after mixing and matching parts until I was blue in the face. Pickup the rear and roll it up on its nose. howhit 150cc gy6 vacuum line diagram [92,775 views] We've launched an improved GY6 Technical Center for 2014! We're in the process of bringing all of these old articles to the new system. or was it just pulsation. Often a small screwdriver will be needed to pry between a cam sprocket tooth and the link to get that last half a link in place before the joiner link can be inserted. The purpose of that tiny hole is to allow air to go n and out on the other side of the diaphragm, so trapped air isn't providing pressure for the vacuum to work against. So many people rely on the functionality and durability of a sewage ejector that knowing how to do some minor diagnostics and repairs are a must for the homeowner. This can typically be fixed by cleaning. Review (mpn:ltf400 for sale) Lt400 Ltf400 Eiger 400 Replacement Quad Fuel Ltf Lta400 Vacuum Valve Petcock. I have manual petcocks so I just installed them to the old petcock vacuum points on my carb mounts. Petcock - Non Vacuum Type to Replace 1978-84 Vacuum Type Petcocks. Think of it this way: the vacuum petcock on PRI is just like any other normal petcock. Internet threads suggested going to a Yamaha dealer and picking up a petcock for one of their off-road models. Time to start another build! This will be my fourth FF build, and the first one that doesn't look like a Roadster. Activate the engine starter motor and turn the engine over. Brazil and the United States led the industrial production of ethanol fuel in 2014. Remove tank and invert or siphon. The throttle (green) is a valve that swivels to open or close the pipe. Replacing or cleaning the bag on a vacuum is important because for preserving the condition of the motor; when overfilled, the motor has to work harder to operate the appliance. Solutions are needed. The Ninja 250 uses a gravity fuel feed by locating the fuel tank higher than the carburetor. Fired Boiler – Coal Fired Boiler Manufacturer from Ahmedabad. Get the best deal for Motorcycle Fuel Petcocks & Taps for Honda CB650 from the largest online selection at eBay. Another option is the Yamaha Raptor petcock, it is a common replacement on the DRZ because it's a manual petcock and not vacuum operated. If you had a vacuum guage hooked up you would see what I am talking about. With the vent port closed how does that work having it capped / is the vent port used like a fuel pump when working? Did it let air in. just don't understand 2 T's hopefully he will show us some pictures _____. net Forums category; My dad has an 02 Kawasaki ZRX-1200R that is his old bike. Never attempt to synch carbs without verifying that there are no vacuum leaks. The petcock on the ZR-7(S) is vacuum operated - hence, there is no "OFF" position. Our Petcock air bleeder valve is made of brass. Simply unscrew wing nut to drain water and condensation from your tank. Behind these screws is the vacuum operated ON valve. first it just some moisture build up around the fuel valve. There is an o-ring that does the seal so no force is required. The drop in air pressure creates suction on the fuel pipe (right), drawing in fuel (orange). Any advice for what to do once I get the carbs pulled? I have a second set on a shelf, so maybe I can practice with those first, or even do the work on them and swap 'em. Most bikes that I owned (all of them Japanese) had 3 ON/RES/PRI ON - when is ON it allows t. Hook up a vacuum line between the petcock and the hand-actuated vacuum pump. The original is non existent. The obvious things that are different are: 1. To check for a spark, remove the spark plug from the cylinder. Vacuum only operates the ON/OFF function. Draw a vacuum on the vacuum line. On my 80 Suzuki gs550l can anyone help explain how yo hook up the hoses to the tank correctly, they're hooked up but I'm not sure if its right. As soon as the vacuum is drawn, fuel should flow. One is for oil injection and the other is to vacuum fuel from the petcock. Leaking Vacuum Lines make it sporadic. Also, if you do not have both air. When the engine is shut off, the fuel flow is shut off. It works great and I'm very pleased with it. Most bikes have a Fuel Petcock Valve on the engine to shutoff the supply of gasoline. If not you will have to remove the petcock and clean it. Drain fuel from tank. However that shouldn't matter if your petcock shuts off fuel flow correctly. I have googled and searched and read that you must apply vaccuum on one of the hoses in order to open the petcock. Fuel Flow Rate: With no in-line fuel filters installed and the carb. Manttra Pressure Cooker (Code 16630. With the vent port closed how does that work having it capped / is the vent port used like a fuel pump when working? Did it let air in. How does the petcock wo- question about Vacuums. Checkout View cart. Please consider joining our community!. A stopcock is a form of valve used to control the flow of a liquid or gas. My KTM will sit for weeks with the gas on but the needle holds the fuel in the carb just fine. The term is not precise and is applied to many different types of valve. I think in the meantime I'm going to install an in line shut-off valve for the fuel so I don't blow my garage up, and burn down my house. Whether you're looking for a rebuild kit, a repair kit, a brand-new petcock or a single valve, you'll find it at BikeBandit. Why do other petcocks have to have the fuel turned off? I want to replace the leaking vacuum style petcock. I was able to make it work by slotting the screw holes in the plate and gasket. Also, if you do not have both air. Fuel petcock valve Posted by Earlyere W on 16th Sep 2018 It's just what I needed to get fuel to the carb again but it seems like I'm gonna have to clean the whole carb anyway (or replace it) and get a new started solenoid and switch. Be sure you hook up the right ones. study a diagram closely. Yeah, just get a petcock with on/off switch to replace the vacuum operated petcock. The stock LT80 petcock is a bit of a mystery to many owners. How does a frost free valve work? Prevent Freezing. My stock petcock failed on the trail and I had to truck the bike out. If there is no gas flow. If a petcock is a faucet like thing to turn fuel on or off or reserve, the Volusias don't have one. Vacuum nipple under Carb 1 to the petcock vacuum port; vacuum nipple under Carb 2 to the fuel pump vacuum port. That pulls the piston down real quick, which develops a momentary vacuum in the tract before air coming in past the throttle plate fills the vacuum. This is used where the space constraints do not allow the incorporation of the Automatic Vacuum Shutoff into the fuel valve itself. A new air filter element is about 20$. Vacuum only operates the ON/OFF function. Building A Model Boiler - A Laymans Guide To … 2019-3-11 · A small sample of some of our work. The vacuum also keeps the electrons in the tube from colliding with air molecules which would generate noise. I've got a new set of float needles and seats on the way, but that'll only take care of half of my problem. I noticed the new carburetor I got in has a plastic cap covering the vacuum port inlet. you should be able to pick up a vacuum pump at most auto parts stores. com FREE DELIVERY possible on eligible purchases. if you intend to drain the tank completely, turn the petcock to reserve. Connect the fuel line hose to the fuel petcock. So many people rely on the functionality and durability of a sewage ejector that knowing how to do some minor diagnostics and repairs are a must for the homeowner. This supplies vacuum to one side of the diaphragm, opening the fuel valve inside the petcock. As a next step, remove the petcock and inspect the diaphragm. Replace it if it's dirty or too old. Let us know what you find. Sit down on your butt along one side of the bike. A Vacuum driven (PRI/ON/RES) works the same way in PRI (prime. Gas tank will start to drain. How to test gy6 150cc fuel petcock valve ( scooter / Motorcycle. However, fuel should not flow in the On position, with the engine off, if the vacuum portion is working correctly. The vacuum casting process can be used to make parts to extremely fine level while keeping concessions to the bare minimum. There is another issue here in either a dirty needle and seat or mis-adjusted/heavy float. Usually, 2 hoses to the petcock means that one is the fuel line and one is the vaccum line. Why is this? Does this carburetor have something that allows the fuel to not be shut off at the floats or something? A:. After discovering a diaphragm problem on my NV400 petcock, resulting in a high rpm misfire, I have decided to turn it into a manual type by removing the pressure spring. The system, used and reliable until the late 1920s [and early 1930s], is important in an authentic restoration of an early vehicle. Some also worry that the reserve tank might run out of gas independent of the main tank, but they can't figure out how to fill it. I suspect I need to rebalance the carbs as I capped off the left side vacuum port when I removed the petcock. The big nut spins on the petcock. Our Petcock air bleeder valve is made of brass. Hi all My petcock is stuck open. This is the most common valve found in use today. It provides protection against backflow, or back siphoning, of water from the irrigation system to your home's fresh water supply—your drinking water. Maybe I can replace the jets and do some other cleaning, then let the shop do the synchronizing. OEM will work but it is a vacuum operated petcock and the diaphragm can fail causing the contents of your gas tank to be emptied into your carb and then into your engine (which is not good). That's with the petcock on ON or RES. It could be plugged. Can anyone shed some light on that for me?. Fuel Pump & Vacuum Line Routing. If your old petcock valve is leaky or can't deliver the demands of your upgraded motorcycle air intake and fuel systems, J&P offers a huge range of petcock valves to fit any budget and any sized motorcycle engine. With higher vacuum, the switch closes, connecting the ignition module lead to ground. Picture of right-side carb, with the throttle plates facing the camera. This will prevent gas from getting in to that side. Although it seems to be screwy because it developed a leak where the fuel line connects once and would only leak when the vacuum line was connected even though the bike wasn't running. Also found out that wetting the inside of the vacuum hose with spit sometimes has the effect of restricting the vacuum. I'm just helping and don't really want to invest in a shop manual. You can test it by taking a turkey-baster, connect it to the vacuum line and draw a vacuum on the line with the turkey-baster (or an actual vacuum tester). ) A vacuum driven uses a vacuum hose from the engine to open and close the fuel valve. Close it tight. Most now have an automatic, vacuum operated petcock (that may include a prime position which bypasses vacuum operation and allows fuel to flow to the carburetor without the engine turning over). All 1978-84 North American market 650's have original petcocks operated by Vacuum from a line to the intake (on carb holder). To work efficiently, pipes need a way of regulating how much fluid can pass through them; they also need a way of switching the flow off completely. Case in point the manual petcock that fits my suzuki DR200se is from a yamaha raptor. Do more work with more power Femitu GY6 50cc 150cc Vacuum Fuel Pump Petcock Roketa Sunl for TAOTAO Chinese ATV Scooter Fuel Gas Switch Pump Valve Petcock For. The number of tools at an automotive technician’s disposal is truly amazing. Remove tank and invert or siphon. The vacuum line is usually smaller than the fuel line. Ninja 250: Petcock Problems The petcock's job is to control the flow of gasoline from the tank to the carburetors. 3/8" Pipe Thread with wing nut. The vacuum tank is a fairly simple device using engine vacuum to pull gasoline out of the main tank and into a reservoir from which it gravity-feeds to the carburetor. does anyone have a photo of the exact hose I have to do this to? If I stick this hose into my shop vac will that be too much vacuum?. Just wanted to ask you if it's possible to drill out a faulty vacuum petcock without removing it from the gas tank? Can I just stick a piece of hard metal wire and poke dead the remaining pieces of the membrane? It's winter here, I have no warm place to work on the scooter for longer periods and I need it every day. My stock petcock failed on the trail and I had to truck the bike out. Rebuilding Yamaha Vacuum Operated Fuel Valves (Petcocks. Between the steel walls of the cup, there's a vacuum (not a perfect one, but sufficient to be significant for heat transfer effects). The purpose of this fitting is connect ion to a vacuum actuated petcock via a hose. Have two pistons doing it at a high rate of speed and you wind up with a pretty constant state of vacuum there - it actually does fluctuate, but it averages out for our purposes. If the vacuum hose is leak free and has good connections, the petcock is faulty. The original is non existent. Some aftermarket ignitions such as the DYNA 2000, bypass the VOES altogether. CV Carburetor upgrade. How Does a Motorcycle Work? Fuel Petcock Valve. This one is vacuum operated whereas the stock one I don't believe was, it was gravity fed from what I can tell. You'll find lots of options if you need a normal level fuel petcock, or for larger, thirstier motors choose a high-volume. To keep the pipe between the shut-off valve and the faucet outside from freezing, a sillcock pipe is drained through a small hole known as a petcock to keep it free of water for winterization. fuel injection has eliminated the use of carburetors and floats to control fuel flow. Remote Vacuum Valve. 1982 Suzuki GSX 1100 E fuel valve positions how does a petcock work on a 1982 Suzuki gs1100 @ - Suzuki 1983 GSX 1100 E question Search Fixya Press enter to search. When this is cut you need to close off the vent and vacuum port by connecting the two ports with a hose or sealing these off with J-B Weld (or a similar product). HD was ahead of the game with it Carb bikes are gravity feed fuel the Government was looking at requiring different types of safety shut off to prevent fuel leaks. the carbs fill up and slowly the gas trickles into the cylinders and seeps past the rings and into the crankcase or The other possibility is of course that there's a leak in the petcock diapragm and the fuel is being sent directly down the vacuum line. the fuel petcock could be vacuum operated, closing with the engine off. Building A Model Boiler.