Quote:
Originally Posted by heatdeath
How do I apply a vacuum to the petcock? Would a siphon rig work?
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I use one of these
vacuum pump & gauge combos. Really handy for troubleshooting like this because you can connect a T to petcock and measure actual vacuum levels.
1. IF you have low vacuum < 10 in.Hg., vacuum hose is leaking or kinked
2. IF you have high vacuum > 15 in.Hg, but still no fuel-flow, then petcock is bad and not opening enough
Simple diagnosis process with minimal time spent and no replacing of perfectly good parts with brand-new perfectly good parts. Also works great for bleeding brakes too.