At 08:57 PM 12/18/2007, azsun99 wrote...
>Is the fuel pressure on the return to tank side of the pressure reg.
>the same as, or less than, the injector side of the system, i.e.
>between the fuel pump and the injectors?

It depends entirely upon what sort of restriction there might be in the
return path. If you block the line, the FPR will open up, and you'll
get as much pressure as the fuel pump can deliver. With a normal
situation, I suspect you would see no more than 1-2 PSI when measured
near the FPR. Remember, the outlet to the gas tank is at "zero"
pressure, so there's nothing to keep that line pressurized except
friction.