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02 LT80 fuel petcock question

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What the hell does "PRI" mean? Why can't I shut the fuel off and what is the hose coming off the back of the petcock that constantly drips fuel?

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Pri is prime that means fuel flow regardless of the quad running or not.  The hose on the back is a vacuum line. With petcock in the on possession no fuel will flow unless the engine is running and that back line has vacuum then the petcock will open and let fuel flow freely (if it's working right)  It should not have fuel coming from that back line that means there is a problem . 

  

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