I have a stock 95 metal LT1 fuel tank, with a sumped magnafuel 4301 and while redoing my fuel lines (going from stock to 8an) I read that I should have at least a 8an vent to the tank. While I was using pump to drain tank, I heard the tank suck in on itself so thats prob not a good sign.

What have folks done to properly vent their stock tanks?

 

Keep the EVAP system operational.

 

No can do, intake manifold has no provisions for it, and or, computer won't run it.

I bought a 10an roll over valve/vent last light and will be installing that.