Hissing from gas cap?
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Thread: Hissing from gas cap?

  1. #1
    Junior Member TexasTW's Avatar
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    Hissing from gas cap?

    It was a beautiful day in south Texas (around 85 degrees) so I took the TW out for a 50 mile ride around the hill country. I filled up with gas about halfway through the trip.

    I noticed when I got home that I was hearing a hissing noise coming from the gas cap even after turning off the power and the petcock. Also, a strong gas odor was noticeable. I took off the gas cap, and put it back on and the hissing continued. I inspected the gas cap and the gasket seemed to be in good shape. Nothing noticeably wrong could be found.

    Is this a normal decompression sound after a ride on a warm day?

  2. #2
    GOF
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    The tank vents through the cap. I suppose if the fuel was very cold and expanding as it warms it could be venting vapors.
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  3. #3
    Senior Member Badgerflorida's Avatar
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    Kinda weird that it was hissing after you released the pressure but I suppose if gas had splashed on the vent openings it could still hiss a little. I’ve never heard any of mine hiss.
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  5. #4
    GOF
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    Not sure I would notice with this damn tinnitus.
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  6. #5
    Senior Member Ski Pro 3's Avatar
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    The california version has a canister to vent through in order to 'catch' the fumes.
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  7. #6
    Senior Member Maxpower's Avatar
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    my bike doesnt do that .
    I think your have a snake in your gas tank
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  8. #7
    Junior Member TexasTW's Avatar
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    Thanks for everyone’s feedback! I took it for another ride and it didn’t make the noise or smell of gasoline this time. I’ll keep an eye on it and let you know if I find anything else that might have contributed.
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  9. #8
    Ken
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    You just Hisssssed it off. Issue solved, it wanted another ride which you did.

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