I looked up the Carter P4070 and Summit says it is a 4-8 PSI pump. Electric fuel pumps usually have TWO pressure ratings. The lower one is at MAXIMUM fuel flow rate (something you will never approach on a Corvair) and the higher pressure is WHAT YOU WILL SEE AT THE CARBURETORS. so the Carter is an 8 PSI fuel pump. I recall you saying your carburetor preferred 4 PSI. Hmmmmm.JohnDB wrote: ↑Thu Jul 13, 2023 6:34 am
I looked at plumbing in a fuel pressure regulator, but by the time I modify all the lines to add the regulator on the output of the mechanical pump, I decided to make the move to an electric pump. Some fittings are on the way, along with a Revolution Electric fuel pump controller, and some tubing to make new lines to the carbs. I picked up the fuel pump plug from Clark's a while ago and plan to run the lines to the front of the engine bay. I've got a Carter P4070 pump, suggested all over the Internet for the carbs I'm running, and hopefully I can get the install started this weekend.
The other issue is a rotary vane pump runs cooler if there is a by-pass line back to the tank which only the Turbo Corvair used.
The simple old pulse pumps don't need a return line and have a proven reliability. Unfortunately the AirTex pump everyone used is no longer made (company was sold). The Facet pump 40105 or kit 40101 is rated at 3.0 to 4.5 PSI (4.5 PSI at carburetors). Many have used this pump for year without issue.