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  1. #1
    SpectraBrite's Avatar
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    95 sl 750 - Pressure in fuel tank ...

    I noticed after my ski is run if I remove the gas cap there is a woosh of air, this happens even if I wait days to open the gas cap.

    I thought there was a vent to stop this.

    Can anyone explain whats wrong here?


  2. #2
    johnsonmtz's Avatar
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    Positive pressure is okay, just not too much. If the whoosh of air is suction, you have a problem that needs corrected.

    There are 2 vent lines on your tank and air flow direction is different on each one. The inlet valve allows air in to displace liquid volume as the ski uses fuel. When positive pressure exists it forces this valve closed so vapor doesn't escape. As I said, if the whoosh is a suction there is a problem and it means the inlet valve has a blockage.

    The outlet valve is spring loaded and is preset to maintain up to 1.5 PSI in the tank. Once that value is exceeded the check valve opens and relieves the pressure. If you're getting a major rush of air, it's possible this check valve is plugged and is allowing too much pressure buildup. If the air coming out is just a quick spurt you should be just fine.

    KJ

  3. #3
    SpectraBrite's Avatar
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    Not sure if its sucking in or pushing out, Ill have to pay more attention.

    It is deff more than a quick spurt though.

  4. #4
    johnsonmtz's Avatar
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    The sound will last longer when there is less fuel (more air space) in the tank. It should sound about like saying the word "push" holding the -sh for a brief second. If it lasts a lot longer tan that, you might have a bad vent valve.

    KJ

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