Pressure building in tank

Treblig said

I don't disagree that the vent line be cleared, that's always a good idea....but it won't explain why the engine only has problems in hotter type weather?? If the vent line was clogged/plugged it would effect the engine all the time (hot or cold)???


treblig

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I completely agree with you. Most of the time fuel tanks building pressure or vacuum won't affect vehicle operation. If you think it is, there's a super easy test to perform, take the gas cap off and see if the problems repeat itself. If they do it's not a tank pressure/vacuum issue. Doesn't sound like the OP has tried this yet.

If I was placing bets i'd bet that the OP, especially since running an Edelbrock carb, is having a fuel boiling in the carb issue, especially if the heat crossover on that performer intake wasn't blocked off.

@TrailBeast has mentioned this in other threads about Edelbrock carbs. I run an Edelbrock with a coolcarb spacer and heat shield to try and help this, along with heat crossover blocked off.