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Where is the gas tank petcock - GAS Motorcycles

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Its at the bottom of the tank one side or the other.

Posted on Apr 13, 2015

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Posted on Jan 02, 2017

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Gas going into crankcase


Hi, Hb there are three ways in which gas can get into your oil tank/system:
1. Someone deliberately pours gas into your oil tank.
2. The vacuum petcock control rubber fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end where it gets pumped back into the oil tank.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until the float needle and seat no longer function properly thus inviting gas to enter the combustion chamber eventually finding it's way to the oil tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.kawasakimotorcycle.org/forum/kawasaki-streetbikes-sportbikes/130968-gas-crankcase-oil.html
Gas leaking into crankcase
Gas fuel in crankcase

Nov 12, 2016 | Motorcycles

1 Answer

How to change the vacuum diaphragm on a 2000 fat boy petcock


empty gas tank you can remove the petcock after you disconnect fuel line and vaccume line open petcock and replace diaphram reassemble and reinstall connect hoses and fill if you cant remove petcock from tank on the bike you may want to remove the tank

Jun 03, 2015 | Motorcycles

1 Answer

Think same problem with my bike the fuel does not flow fr the tank to the hose and to the carburator i got hyosung gt250r its been a month before i start the bike thne sudden ly fuel not flow


Sounds like the gas tank may have some crud in the bottom that is prevent the fuel from flowing through the petcock.. OR the petcock itself is stopped up. Make sure the petcock is not stopped up first.. then make sure the tank is clean. My personal ATV went through this very thing...the TANK and the PETCOCK were stopped up.
You are going to have to remove the gas tank to do this,
BE CAREFUL!!!!

May 12, 2014 | 2008 Hyosung GT250R

1 Answer

1987 Honda VF 700 C fuel leaks into the oil tank


Hi, Anonymous you're getting ready to go riding you pull out the dipstick to check your oil level and are greeted with the unmistakable smell of gasoline. What happens next depends on the following:
1. You have experienced this before and do not start the engine but do change your oil and filter leaving it 1 quart low until the engine reaches operating temperature then top off as necessary.
2. The amount of time your bike has been sitting since the last time the engine was running.
3. The amount of gas and contaminants in the tank.
4. The oil pump location, exterior or interior.
5. The condition of your petcock gasket/seal/diaphragm.
If your gas tank was low and you start the engine probably nothing you would notice but if your gas tank was full and you start your engine the oil/gas mixture can blow into your air filter, come streaming out of your crankcase breather hose, and launch your oil tank cap followed by a blast of oil. The mess can be minor or you need to call a Hazmat team for assistance. This will also happen if you overfill your oil tank.
Next is the how and why gas can get into your oil tank/system:
a. The vacuum petcock rubber/diaphragm fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until contaminants from the gas tank build up in between the carburetor needle and seat breaking the seal thus inviting gas to enter the combustion chamber eventually finding it's way into the bottom end and the oil tank.
4. Bottom line if you're not going to ride your bike for a while turn off the petcock.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1985 Vf700c Magna fuel issue
1982 Honda Magna VF750 V45 Carburetor Vent Pipe Fuel Leak
http://www.cantonmg.com/stewsplace/ShopManualVF700C.html
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-vf-owners-manuals

Jan 17, 2014 | 1987 Honda VF 750 C Super magna

1 Answer

How to clean gas tank and carburator of old gas


Get some carb cleaner and get that carb dismantled and sitting in that carb cleaner for a few hours. Drain that tank and run some approved gas tank cleaning agents all through it. Take the petcock off and check/clean out and usually - there'll be a filter type set up either attached to petcock or on inside of tank. The carb, the petcock and the tank - get them right before you even try to start it.

Jan 05, 2014 | 1997 Honda VF 750 C Magna

1 Answer

I need to replace the o ring (petcock) on my 2004 honda shadow aero and need to know if i need to remove tank or maybe get special tool to remove petcock


Drain the tank. You should be able to remove the petcock by simply turning the nut holding it on or turning the whole petcock assembly. It may be stuck in place by the o-ring/fuel filter inserted into the tank. Be sure the filter is in place when you put the petcock back on or you will have problems with leaking gas out the carburetor overflows (from tank rust getting into the carburetors). Chances are the leaking gas is not form the tank sealing o-ring, but from the vacuum diaphragm assembly attached to the back of the petcock. Part # 5 on the microfiche.
http://www.bikebandit.com/houseofmotorcycles/2004-honda-vt750c-shadow-aero/o/m2881#sch407448

Sep 05, 2011 | 2004 Honda VT 750 Shadow Aero

1 Answer

Reserve fuel does not work. Rand tank out of gas, switched over to reserve and could not start it. Had to refill gas tank and switch back to normal then it ran. Have to only run by mileage on main tank...


With the age of your machine , you should drain the tank and remove the petcock. If you can take it apart rebuild it. If you have no reserve , either the reserve tube is broken off or the petcock is plugged. It is possible the four hole washer the seals the the lever and diverts the fuel is damaged , worn , or broken. Depending on the over all condition of the petcock replacement of the entire unit may be the best option. At any rate an new fuel petcock would definitely fix this issue. Rebuilding your old petcock is only an option if all the parts you need for it are available.

Nov 10, 2010 | 1982 Suzuki Gs 550 L

1 Answer

Wont stay running,like its out of gas. but its not


It may indeed be out of gas. You can have a full tank of fuel and be "out of gas" in the carb. The culprit could be the vacuum operated petcock. The petcock has a diaphragm in it that is opened by engine vacuum. If that diaphragm is not functioning as it should, no gasoline gets to the carb.

To test the petcock, reach around behind it and feel for a small vacuum hose. Unplug this hose and replace it with a hose you can **** on. Using your mouth, **** on the hose with the fuel line disconnected. You should see fuel flow out of the petcock. If not, you must drain the tank by loosening the petcock and allowing the fuel to run out of the loose petcock. Use a large funnel and an empty fuel container to catch the fuel. Once the fuel tank is empty, remove the petcock. Take the plate on the back of the petcock off by removing the four small screws. You'll find a diaphragm, a small spring, and a needle. Hold the diaphragm up to the light and stretch it gently. If you find a hole in the diaphragm, replace it. Check the petcock for obstructions by blowing through it. Reassemble the petcock and test it again.

Check the hose that supplies the vacuum to the petcock. It comes from the backside of the carb and runs upwards to the VOES switch and then reduces in size and goes to the petcock. Make sure it's connected and has no holes or cracks in it.

If everything looks alright, replace the petcock, connect the hose and try to start your bike again.

These petcocks are notorious for giving problems. I always recommend that the vacuum operated petcock be replaced with a high quality manually operated petcock such as a Pingle. They're expensive and require you to manually turn the gas off like the "old school bikers" do but they won't leave you stranded out of gas with a full tank of fuel.

Good Luck
Steve

Jun 17, 2010 | 2003 Harley Davidson XLH Sportster 883...

1 Answer

How find out reserv or main at petrol tank


Do you have a petcock on the bottom of the gas tank? If so, if you have a "reserve" the petcock will have three positions, off, regular and reserve. If you only have a two position petcock you have no reserve function. Petcocks work by taking the gas in the petcock tube higher up in the gas level, once the gas level drop below a certain level on the gas tank pickup tube, the petcock has to be switched to reserve where the tube picks up gas at a lower level. Hope this is not too confusing.

May 05, 2010 | 2006 Bajaj Discover DTS-I

2 Answers

Motorcycle shuts off as I am riding, like if I am running out of fuel, but has plenty of fuel if I mess with the petcock it starts up


Check that the carb is getting plenty of gas. Check in-tank filter if needed. Same with external filter as well. Also make sure you have a good strong spark, if not, coil or charging unit may be faulty.

Sep 16, 2009 | 2003 Harley Davidson FLHT Electra Glide...

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