Question about 1979 Harley Davidson XLS 1000

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HD 1979 fatboy fuel petcock valve leaking

Fuel petcock valve leaking leaking from the small vent line ant bottom of fuel on/reserve selector switch. does not leak when bike is shutdown only when running.

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  • Anonymous Mar 14, 2014

    fuel tap not turning off when turned off bike still runs

  • Anonymous Mar 19, 2014

    from petcock

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  • 379 Answers

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.

Posted on Jul 23, 2009

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Hi Anonymous, and the usual suspects are:
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Hi Anonymous, and the usual suspects are:
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Hi Anonymous, if you have a carbuerator the petcock/fuel valve is located on bottom rear of the left side of the fuel tank. With the long end of the lever pointing straight back the fuel valve is in the off position and no fuel will flow to the carbuerator, with it pointing straight down the valve allows fuel flow from the gas tank to the carbuerator, with it pointing straight forward it is in reserve mode and you have roughly 1/2 to 1 gallon of fuel left in the gas tank. If you are fuel injected the is a low fuel warning light either on the dash or speedometer. If you have a fuel gauge refuel before it hits empty just like your car. Good luck and have nice day.

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Hi, Alan always check fuel flow first to isolate the problem area otherwise the usual suspects are:
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4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing
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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.
http://www.triumphriders.nl/FoldersPDF/Daytona_900-1200_(1993-1997)_Service_Manual_(eng).pdf
http://www.worldoftriumph.com/triumph-motorcycle-parts.html
Triumph Motorcycles
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To see what is wrong you will have to drain the tank and take off the fuel tank outlet(filter assembly). What you should see is a tube sticking up with a fuel filter over it. The tube allows the fuel to enter the carburetor down to that level , when the fuel petcock is in the ON position. When you switch to RESERVE the rest of the fuel flows down through a hole at the base of the fuel petcock. If the tube is missing from the fuel tank outlet(filter assembly) or/and the actual fuel petcock switch (sometimes a separate part )you will not have RESERVE. Another way you have no RESERVE is if you have a leaking four hole washer in your fuel selector. This allows the fuel to flow from RESERVE to ON inside the selector valve(gas leaking in petcock but not escaping outside petcock). "Honda" has all sizes of 4 hole washers available, but , the assembly may not be designed to be taken apart and reassembled. In either case you may end up having to buy an assembly to fix your problem.

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Hi Scott, and the usual suspects are:
1. No fuel in gas tank.
2. Fuel valve not switched to on or reserve.
3. Fuel cap not venting properly.
4. Fuel filter clogged.
5. Vacuum line broken, cracked or not connected to petcock or intake manifold.
6. Fuel valve diaphram faulty.
7. Fuel line to carburator blocked or kinked.
8. Float valve needle stuck to seat.
Good luck.

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Your petcock is vacuum operated. Gasoline leaking from the vent hole indicates that the vacuum diaphram is ruptured. A new petcock assembly is needed.

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