Question about Yamaha Electrical Supplies

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Why does my Yamaha EF1000 Generator leak gas out of the gas tank vent hose which comes out of the fuel petcock (on/off valve)? It does it when its not running but and even a few moments after it has ran, and also when it is running sometimes it will leak but just a little bit? the carb is clean and vent/overflow line from carb is perfect and not restricted and never leaks, so the carb is not overflowing!, and the engine always starts and runs great! but i keep loosing fuel? But a note, after it sits not running and/or after it has ran, you can remove gas cap and hear pressure release! Any answers would be appreciated!, Thanx A Million

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Check that the vent hole in the cap isn't obstructed.

--W/D--

Posted on Jan 18, 2011

  • 2 more comments 
  • promodx Jan 18, 2011

    The Tank does not vent through the cap, the tank vent line is plugged into the side of the petcock fuel valve somehow!, any other idea's? Thanx A Million for the reply, as that was my first thought to the answer to the problem!

  • woobie dog
    woobie dog Jan 18, 2011

    Some Yamaha products require a vacuum to keep the fuel diaphragm in the petcock open, allowing fuel to flow. This, however is not on the tank side of the petcock, indicating to me that there shouldn't be a vacuum on the tank. Try running the genset with the cap cracked enough to allow the entry of air to the tank. If the problem corrects, look for a means of venting the petrol tank. If the problem persists, consult your dealer, and see if your petcock requires a diaphragm type system as described above. If so, you may need to replace the diaphragm.

    --W/D--

  • promodx Jan 18, 2011

    Your fast on the draw with the answers, i like that and thank you, However the petcock on the tank does not use a diaphragm setup, which i know what you are refering to from my motorcycle experiance, But it uses just a basic type on/off petcock with the little rubber valve inside and normal cover, control lever with o-ring with the two screws and that bolts to the bottom of the fuel tank but does have a vent hose running from it along with the fuel line on the opposite side, i am starting to think it is that rubber valve in the petcock that rotates when the petcock lever is rotated from off to on that is coming apart or has hardened and not opening the vent part or something when valve in petcock is closed which is activated by the control slide lever which is three position off/run/choke and when the control slide lever is in the off position it moves a lever and turns the petckock to the off position shutting off fuel, on run and choke it turns the petcock on allowing fuel flow! but to me shouldnt the tank be vented regardless of fuel valve position? if you look up the parts diagram on yamaha-motors website you can see the petcock and parts, i guess it looks like i will just have to take it all apart and see whats going on! What do you think?

  • woobie dog
    woobie dog Jan 18, 2011

    Yes, I agree that there should be a tank vent, and that it is plugged. Did you try running the engine with the tank cap cracked? You may have to disassemble the petcock and check to see if there is internal damage. If so, the repair costs will be minor.

    Good luck!

    --W/D--

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