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Originally Posted by Rick Dorion
I would either drill a small hole or order another cap from Rick's or whoever you prefer doing business with. With a phenolic spacer I don't see how the fuel is getting so hot as to perculate in the carb. I have the Holley thick gasket, and some thermo-wrap in the engine compartment , nothing exeotic, where my fuel line is within 1" of my uncoated headers and never see this. The cap sounds suspect obviously since you're seeing/hearing pressure build-up.
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I have a vented cap, but i think its faulty because i hear the unmistakable sound of vacuum sucking when i take the cap off.