Can't get Fuel pressure above 5.5 psi - Page 2

Night Enforcer · #1 (**permalink**) 07-28-2011, 06:41 PM

Sounds like you are on the right track in checking every thing out. KEEP THE RETURN FUEL LINE! Depennding on the fuel you are using (oxygentaed etc) it will save you a lot of headaches with vapor lock. In Arizona vapor lock can be a big issue due to the heat and the fuel mixes. In tests, some of the oxygentaed fuel we get in TUcson and Phoenix begins to "boil" at 160 degrees. I have installed return lines on 6 Cobras including a Kirkham which has two fuel pumps, an electric and a mechanical. Solved the dreaded vapor lock.

RestoCreations · #2 (**permalink**) 08-13-2011, 09:36 AM

Ok, the car is pretty much complete and i am now back to tackling the fuel and ignition problems.

I replaced the summit fuel pressure gauge with an aeromotive unit and i put it inline before the carburetor. Battery is fully charged and i am only getting 6PSI with the fuel pressure regulator completely closed off.

Time to send the pump back???

Michael C Henry · #3 (**permalink**) 08-13-2011, 12:17 PM

I went from the 2 7 psi pumps to 2 15 psi 100 gal/hr, 5/8" fuel line BG diaphram adjustable fuel log adjusted for about 6 psi inches away from dual carb single inlet and return line to tank. I think it is noiser. I think I loose fuel to avaporation in tank due to airation. And lastly BG went out of busniess and if anything ever happens to regulator, I do not know what I'll do.
My fuel tank has a dropped forward facing sump just in front of rear diff , Fuel flows first from two seperate pickups at differenet heigths in tank sump, pre cleaner filters, fuel pumps, inline check valves, billet "Y", BG 5000 filter on firewall, then to front of fuel log, past carb single inlets. The adjustable fuel pressure regulater is at rear of fuel log and then fuel line returning to right front of fuel tank. I tried to make an intank difuser for returning fuel line so fuel doesn't spray upward to hit inside top of fuel tank, like a fountain. Everything near engine is wrapped in refelective heat sheilding. Hard tubing and SS flex braided fuel hoses where needed. Fuel vapor lock has not been a problem since.