godreject

iTrader: (1)

so i install my bbk afpr and are excited to bump up my fuel pressure. unfortunately fuel pressure is way low, the adjustment is turned all the way and the most i have is roughly 36psi. if i only turn the key and let it prime i only get 25psi, weird thing is fuel pressure jumps between maybe 30-38psi and when i give it some gas pressure drops,

could be i be correct in suspecting the fuel pump, i do have a hard time starting the car when its cold, and the fuel pressure is low, i doubt my gauge is off, any other means of testing for a bad pump, i would hate it if its the pump, but i'd could care less as long as it gets fixed

400Z28Racer

iTrader: (4)

it is the fuel pump

Russ-So Cal

Before you do the fuel pump which is a pita, replace your fuel filter. It is found on the back side inner fender well on the left rear side of the car. If it is plugging up, it will reduce your fuel pressure.

godreject

iTrader: (1)

nooooo... not the fuel pump, the filter has been replaced its practically brand new, at that same time i also added some fuel stabilizer and fuel injector cleaner, what i don't understand is why if i get 25psi with the key on, how in the world does the car start, i thought u needed 40+ for the car to start.

Kevin91Z

iTrader: (1)

Take the regulator apart again and put a quarter under the spring, then reinstall. If that doesnt bump up the pressure then the pump is bad.

87Marro

ITs the fuel pump

TA

iTrader: (1)

Also put some white grease on the edges of your diaphragm to make sure it's not leaking. Vacuum leak at the diaphragm will cause all manner of havoc to your fuel pressure.

TA

godreject

iTrader: (1)

i will take everything apart friday and give it another try, and get back to everyone saturday, if it works i'l take part of the big bear cruise and if it doesn't work i'l still go to the cruise as long as the car is driveable,

i wonder if the fuel lines could be rusted, looking at them from underneath they look in bad shape, is it possible for a fuel line to rust and create a blockage of some sorts, i wold hate to go junk yard hunting for those fuel line but i might not have a choice

TA

iTrader: (1)

Usually the fuel tank would get crusty inside before the fuel lines. Did you check your fuel pressure before you put the Adj Fuel Press regulator on?

TA

godreject

iTrader: (1)

No i didn't check the pressure before the regulator swap, my mistake, either way i'l redo things friday, and check back with the results, thanks 4 all the help so far really appreciate it.