deimox

Installed the 4309 which I obtained for free from the guy I bought my car from since the one that was installed was leaking (another Mallory, different model didn't utilize the fuel return line). At the time I just wanted my car running without it spewing gasoline all over the toasty engine block. When I installed the FPR the instructions said to use a return line that was of equal or greater diameter than the supply line. The return line on my 1983 GS is smaller than the supply line, but I hooked it up anyway since I just wanted my new car running.

The problem is now that I cannot lower the pressure below ~7.5psi and for the mikuni on my car it's suppose to be between 4.5-5.5psi. I believe that this is a result of the smaller diameter return line. I would like to keep using a FPR that utilizes the fuel return line is there another FPR that can be used with a return line that is a smaller diameter than the supply line or do I just need to go back to a FPR that doesn’t use a return line?

Rx7carl

A holley FPR has 2 outlets. You could use the 2nd outlet as the return. Just use the stock return restrictor so all your fuel doesnt go back to the tank. I guess youll need the 4-9 psi like the one we used in YapaKanichi's mikuni. We didnt use any return on his car though and its fine.

deimox

ok, back to the no fuel return line setup. Thanks for the help.