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07 GX hissing sound and fuel gauge resets to zero

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  • 07 GX hissing sound and fuel gauge resets to zero

    I have a 07 GX pushing 250k miles and no complaints other than a resetting fuel gauge after sitting overnight.
    Tonight I noticed a hiss coming from what seems to be the catalytic converter maybe? Iv'e owned a few NGV's and have noticed the resetting fuel gauge is a sign of a leak in the lines after the tank.
    I can't easily pinpoint the leak and can't smell any gas in the engine area, I can detect some smell in the tailpipe area but it's very faint.
    I'm wondering if an injector is stuck open??? I don't know the system very well but i'm hoping someone here might!


  • #2
    You MIGHT have a pressure relief valve activating. These usually don't go bad , but get activated by a failing high pressure regulator. This is only one thing that could cause the symptom.

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