Does a fuel pump upgrade require an adjustable fuel pressure regulator to back down the pressure for the added flow, or will the stock fuel pressure regulator regulate the flow and pressure to run a stock amount of fuel?

My head says you must have a adjustable fuel pressure regulator to turn the pressure down to accommodate the added flow... Is this correct.



PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

no.. you do not need a AFPR. We have a return type fuel system. the FPR bypass's the fuel/pressure it dosn't need back to the tank, unless your talking a 500lph@200psi pump, your fine with the stock FPR

i been running a stock FPR/injectors with a walbro 255 (was boosted)with no issues. i was getting 30mpg too.