Quote:
Originally Posted by Joel Koontz
I'm not sure that you need, or want, a check valve on a stock type fuel system.
I am not aware of stock systems using them, at least not in the 60s/70s.
When the car is shut off, the fuel in the lines can heat up. If the fuel is prevented from going back to the tank it may cause pressure to build up in the fuel line and force fuel through the carb inlet valve.
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+2, the vapors are designed to be returned to the tank, and then there's the charcoal canister, which I think is vented.