weird issue with fuel tank pressure and venting...I think

[71CHEVYSHORTBED402]

Originally Posted by Rich72C10

well, I do have the canister, my brother just confirmed it. So either the vent line is plugged or the canister is. We also just replaced the QJet. For now the vent line is just disconnected at the canister.

As for the fuel pump, yes it's connect to the tank. My 72 has two lines off the Fuel Sending Unit (one for fuel and the other for vent).

If I understand 72 correctly there should be three lines coming from the fuel tank. Two from the sender to the fuel pump, and a vent line from the tank to a vent assembly (top rear RH pocket of cab) to the canister. Not that there aren't other solutions. The canister was bypassed in both my trucks, but there are other considerations.