Cheath16

Hello everyone, I have an '86 z28 and I have owned it for several years and have just dealt with this problem because nobody really knows how to fix it. The guy I bought the car off of had taken out the 305 and replaced it with a carb 350. However, he didn't do so hot of a job. The biggest issue I am having is I can't fill the gas tank up but half way then it starts coming up the filler neck (no matter how slow I pump gas). Then it over pressurizes like crazy while I'm driving it and after it's parked. He took off the charcoal canister and I'm wondering if I put one back on and vented it the way it was from the factory if it would fix all of this. I know there are tons of threads about this but nobody seems to have my exact problem. Thank y'all.

1987L69

I had that problem on a 77 Monte Carlo, the tank vent should be on the drivers side of the engine bay, a hard medal line, I put a hose and a fuel water separator filter on mine and it fixed it.

Cheath16

Where would you get one of these fuel water seperator filters and how does that help the fuel tank pressurization?