[72c20customcamper]

Originally Posted by dmjlambert

My vote is try it since you already have it on hand. Plug the return line. I have a 69 with fuel pump and tank not having a return line and haven't had vapor lock and I run with gasohol. But I have a Quadrajet and ram horn exhaust manifolds and clutch fan, which may be a completely different setup. 7.5 psi is high to pair with some carburetors, but a regulator would probably solve that if needed. Now that I type this I better knock on wood and hope I don't start getting vapor lock.

My thinking is that vapor lock would be caused in the feed line to the carb since fuel would sit in it when the bowl is full . A return at the pump would only keep the fuel moving in the line from the tank to the pump. Not much heat there with a factory setup . The pump is matched to the Holley carb on the new motor . This will have rams on it too . Putting a Cold Case radiator and fans on the truck . I guess I’ll try it if it don’t work out I’ll use the Holley pump on the engine going in the 68