Question about 1983 Honda GL 1100 Gold Wing

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Fuel leak found fuel petcock THANKS

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Did you check the gasket under it? You can probably cut one of those out of gasket material. Unless you are sure it's the petcock.

Posted on Nov 20, 2008


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2000 Honda Magna 750 leaking fuel from the auto petcock valve.

Hi, Mark for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Leaking fuel out of petcock diaphragm thing
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Jan 28, 2013 | 2000 Honda VF 750 C Magna

1 Answer

Motorcyles starts and then dies and does not restart like lack of fuel

These bikes use a vacuum operated fuel petcock too allow the flow of fuel when the bike is running vs shut off. In other words, it takes a vacuum(bike running) to provide a vacuum. The diaphragm in the fuel petcock has undoubtedly gone bad or the vacuum hose has come off or developed a leak.

Check the vacuum hose first connected to the back side of the fuel petcock and make sure it is connected/not leaking.

The fuel petcock itself can be repaired with a replacement diaphragm kit available from your local Honda motorcycle shop. However, unless you are mechanically inclined I would probably let a motorcycle shop do the repair since it does involve gasoline.

Good Luck with it!

Jun 17, 2012 | 2004 Honda VTX 1300

1 Answer

Bought a 1996 535 virago and it wants to flood out it cranked and ran fine then it wouldn't start and we changed the plug it cranked and ran then it started to flood what should we try

Some Viragos used a vacuum operated fuel petcock that allowed the fuel supply to open when the bike started and shut off when it stopped. There was a vacuum line from the intake to the petcock and this vacuum acted on a diaphram to open the fuel.
Sometimes the diaphram leaks and the intake vacuum pulls in fuel....causing a very rich mixture.
If you find it has a vacuum operated petcock, you could remove vacuum line and briefly open the
petcock manually using the PRI for prime position to see if fuel leaks out the vacuum port.
There are rebuild kits for the vacuum operated petcock

Mar 26, 2011 | Yamaha XV 535 Virago DX Motorcycles

1 Answer

Regarding the fuel stopcock of yamaha chappy, it has three settings: on, reserve and PRI, what is the neaning of PRI?, thanks...

You have a vacuum operated that when engine starts and draws vacuum...a diaphragm lifts in the petcock to supply fuel to carb. When the engine shuts off...vacuum is lost and the petcock closes.
If you run the tank order to get fuel into the carb and get the bike started can open the petcock without engine vacuum by rotating petcock to the PRIME position. Once started return the petcock to the ON position. If you leave it on prime....with engine off...fuel may leak into carb and run into engine and contaminate crankcase oil with fuel.

Mar 22, 2011 | Yamaha YZ 125 Motorcycles

2 Answers

2005 1200 s. Since not being ridden for 6 to 8 weeks,gas has leaked into crank case.Fuel tap has no shut off,so I assume there must be a vaccume activated diafram,of sorts,in the tap.Could this be...

Either the vacuum operated petcock is stuck in the flow position as well as a float needle is stuck in the open position. Two things would have to be wrong so that the fuel would over flow the carburetors and run past the piston rings into the crankcase. Or, more likely, the vacuum diaphragm inside the fuel petcock is leaking and the fuel is flowing down the vacuum line into the engine. I would start by inspecting the vacuum fuel petcock. If you unplug the vacuum line and gas is dripping from the vacuum line then you will need to rebuild or replace the fuel petcock.

Mar 06, 2011 | 2005 Suzuki GSF 1200 Bandit S

1 Answer

My 2000 Harley Davidson Fatboy (carburettor / BT 88cc) is leaking fuel out of its fuel tap. It is coming out of the botton of the fuel tap where it looks like there should have a tube out but there isn't...

Your bike is equipped with a vacuum operated petcock. To check the petcock out, you must remove it from the tank. I usually use a large funnel and an empty fuel can. Loosen the petcock enough to allow the fuel to run out and use the funnel to collect the fuel in the empty can. Once the tank is empty, disconnect the fuel hose to the carb and the vacuum hose. Remove the petcock from the tank.

On the backside of the petcock, there are four small screws. Remove the screws and the diaphragm and needle in the petcock will come out. Hold the diaphragm up to the light and gently stretch it while looking for holes. If you find a hole, replace the diaphragm.

Personally, I've seen enough problems generated by these petcocks to warranty replacement with a high quality manually operated petcock. I like the Pingle petcocks. They're pricey but they WORK. I've seen too many people stranded with a whole tank of fuel and none in the carb because of these petcocks.

Good luck

Sep 07, 2010 | Harley Davidson FLSTF - FLSTFI Fat Boy...

1 Answer

I have a 1996 883 HD XL will start but then dies out.if I crank on and of the throttle I can keep it running. But when I stop it dies out.could this be something plugged in the Carb,or vacuum...

Yes, it could be either something plugged in the carb or vacuum leaks. If the bike has been sitting for over three months, it's probably the jets are plugged in the carb. You'll need to pull the carb and go through it. Use that pressurized carb cleaner to clean out the jets and all passageways in the carb.

Make sure you put a new carb to intake seal on the intake before you put the carb back on. Also, check the hose that comes off the backside of the carb. It supplies vacuum to two things, the VOES switch up between the tanks and the vacuum operated fuel petcock. Make sure the hose has not cracked or come loose from either of these. I at least one occasion, I found the vacuum operated petcock to be leaking air. The bike would not idle. It would run but would pop and spit back through the carb. I had to take it out of the tank, disassemble it, and reassemble. After that, it worked but I don't know for how long. I suggest replacing the vacuum operated petcocks with manually operated petcocks. I've only seen one leak air but I've seen lots of them leave riders stranded with full fuel tanks but no fuel in the carb. They will malfunction and leave you stranded.

Feb 20, 2010 | 1993 Harley Davidson XLH Sportster 883...

2 Answers

1980 gs 1000 fuel petcock has two connections where do they go?

On the one that has two hoses does it still have an "Off" position? Usually petcocks that have two hoses, one goes to the carb vacuum, and the other is for a fuel supply for the engine. That way it only allows fuel to flow when the engine is running. I have found these to be a poor design and can often leak and allow fuel to run into the engine if your carbs are acting up. If the replacement only has one hose, then it will work fine, just be sure to cap off the vacuum port on the carb.

Sep 24, 2009 | 1978 Suzuki GS 750 E

1 Answer

HD 1979 fatboy fuel petcock valve leaking

Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.

Jul 02, 2009 | 1979 Harley Davidson XLS 1000

2 Answers

Fuel leak at bottom of petcock valve 2000 fatboy

Sounds to me like a cracked fuel line. No leaks when sitting still but add the torque of the engine turning over and the vibration and the line flexes enough to leak. If not a fuel line, the weld may be cracked where the petcock mounts to the tank or the petcock itself may be cracked. Is the petcock water trap screwed on tightly?

Mar 15, 2009 | 2000 Harley Davidson FLSTF Fat boy

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