Quote:
Originally Posted by Scattcatt
What makes you think it could be the petcock vacuum line though? I'll give it a shot but I'm just curious.
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It sounds like a fuel-flow issue to me, and if the petcock isn't opening properly or completely it may be restricting flow after a certain amount of time.
Confirming the proper amount of fuel in the floatbowls when it stops running would be another check that would tell you if you had adequate fuel flow to the carbs.
Also check all of the screens and filters in the fuel line.