Is it necessary to install fuel pressure regulator nearby the engine or can I install it at the rear of the car right next to the fuel pump? I would like to keep the engine room as clear as possible. It's a holley regulator, carb engine.
It needs to be as close to the engine as possible. Its the same reason why painters use a regulator ON the gun and the same reason OEMs put the regulator directly on the fuel rail. The pressure variations can be very unpredictable over that length.
You could install a fuel pressure gauge on the engine and put the regulator several feet away, but don't expect it to stay the same. Expect frequent and wide variations in pressure.
I guess doing it "right" dictates no further away than the firewall or inner fender. If you want to try it, I suggest going just out of sight at the base of the firewall.
Yep, I agree with Curtis.
I've only ever used electric pumps on drag cars and then the regulator was at the carb and it was used in a return line to the tank. The regulator is like a bypass. The fuel didn't go through the regulator to get to the carb. The pressure is real stable. Also the pump didn't 'deadhead' against the pressure.