let's try and get this clear

the fuel comes from the pump to the fitting (spring clip fitting on 2wd, jubilee on 4x4) at the rear of the fuel rail (around the 180 degree bend).

the regulator is on the other end of the fuel rail, at the front of the car. it works by backing up the fuel in the rail to a certain pressure. what's left over in the rail that hasn't been injected then comes out of the reg and returns to the tank. as the return pipe is basically vented to atmosphere through the tank, there is no fuel pressure at that point.



taken from:

http://hometown.aol.com/dvandrews/em...njectionschema

hth