I have a 67 GTX with a 440. About two years ago I installed an Atomic EFI throttle body. Intank pump is a PA series from Tanks Inc. and the pressure regulator is from Aeromotive. I recently noticed that the fuel pressure was a little lower than it had been. It is running at about 38lbs. and was set at about 50lbs.. So I attempted to adjust the pressure with the regulator but can't change the pressure up or down what so ever. My question is would you suspect the regulator or the fuel pump? Any tips on trouble shooting would be great.
Thanks
Thanks