This might help understanding the petcock business:
http://www.cycleorings.com/petcock.html
... actually, it needs revision. There is a chance your petcock can leak slowly with no vacuum applied; in fact, I just replaced a petcock on a 7-year-old Suzuki for that very problem.
The way to test is to connect one end of a fuel line to the large fuel tap on the petcock, hold the other end of the fuel line into a gas container and wait a while. Watch for any accumulation of fuel in the container. If there's any at all, your petcock needs rebuilding or (preferably) replacement with OEM.
http://www.cycleorings.com/petcock.html
... actually, it needs revision. There is a chance your petcock can leak slowly with no vacuum applied; in fact, I just replaced a petcock on a 7-year-old Suzuki for that very problem.
The way to test is to connect one end of a fuel line to the large fuel tap on the petcock, hold the other end of the fuel line into a gas container and wait a while. Watch for any accumulation of fuel in the container. If there's any at all, your petcock needs rebuilding or (preferably) replacement with OEM.
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