After motor has warmed and been shut down there are bubbles going up fuel line. Turning the secondary shut off valve to the off position has no affect on them. there does not seem to be a leak at the valve. My old motor had a leak there and it never caused that. I did a heat gun test today and my carb was only 10 degrees cooler than my engine (110 degrees). I do not think my old carb ever got that hot. Could this be causin bubbles even if not boiling point? I have a Starfire GenII Phantom (chrome w/ black jug) that has a different ntake on it that seems to be aluminum. Could this be conducting heat to carb? Also upon shut down it diesels then backfires. hope this is enough info. any questions post them will do best to answer. TY
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