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'84 JS550 Blowing Gas Caps ?

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  • '84 JS550 Blowing Gas Caps ?

    For some reason after parking my trusty '84 JS 550 Stand Up, the gas cap cracks around the threads(seperating from the cap) so the tank won't hold pressure, and no start.

    I found that the fuel tank vent valve was stuck closed, BUT !, BUT! ,that only allows air IN to the tank.-Are there any other vents????

    So, I'm guessing after sitting in a hot building, pressure built up(in the tank) and forced the cap to seperate, due to the vent valve stuck closed.(not letting air in---but the ski ran fine ??????

    Any comments ???? It just Doesn't make sense to me!
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