Fuel Pressure Regulator location

[lippy]

I have a Weldon electric pump and a Weldon bypass regulator. The regulator is connected directly to the pump, and they are both located behind the driver's rear tire, behind a shield. The bypass regulator sends excess back to the tank, and knocks the pressure down to 12 PSI. I have a non-bypass regulator (Aeromotive) at the front of the car that knocks the pressure down to 6.5 PSI and feeds the carb. All of my plumbing is AN 8 except from the front regulator to the carb, which is 2x AN 6. This is what Weldon recommended, and it works.

Tank > Large filter > Weldon pump > Weldon bypass regulator > Large filter (at front of car) > Aeromotive non-bypass regulator > Carb

http://media.wix.com/ugd/79966d_cad9...c3ecd78957.pdf

[fordracing65]

I have a mechanical pump. Does that matter.

[lippy]

You don't need a bypass regulator with a mechanical pump

[fordracing65]

On the FE forum. There is a thread where everyone uses a bypass with a mechanical pump. Pressure is pressure. Even jay brown uses it and explains why.

[427 sam]

Originally Posted by pmangelos

Hi all, I have a question for those of you running Webers. Where did you mount your fuel pressure regulator in relationship to your carbs and fuel pump. I am installing a stroked 351 in a 65 Mustang and have purchased a bypass regulator that I plan on running a return line back to my tank with. My question is do I mount it directly before the first carb, after the last carb, or is it ok to mount the regulator to an inner fender about three feet before the first carb. Any advice is welcome. One more thing, I am using an electric fuel pump mounted near the tank. Thanks for the time.
Paul

you can just see mine on this snap Sam

[lippy]

My thinking is that a mechanical pump's pressure and flow are lower at low RPM and higher at high RPM. It naturally delivers less when the engine needs less. An electric pump puts out max pressure and flow even at idle, so the excess fuel the engine doesn't need at part load is recirculated back to the tank. Not sure why you would do that with a mechanical pump.