godreject

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

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91RS B4C 350 Auto(2500 stall, transgo shift kit),AC delete, smog delete, eldelbrock tes, Don y pipe, dual cat, 3" magnaflow catback, ls1 front brakes, rear pbr's, sphon k-member, tds wonder bar, UMI A Arms, intrax lowering springs 2" msd ignition, umi lcarb, lca's pandhard bar, C6 wheels, plus more misc stuff, Dyno 241rwhp 8/8/09 w/probs

88 iroc l98 350 HSR w/ 58mm holley throttle,headman shorties, flowmaster exhaust,full msd ign. lowered 2" , shaved everything, auto start alarm, th350 tranny with shift kit and 2400 stall, , 3.73 rear end, smog delete, ac delete, gutted interior, battery in trunk cuz engine looks cleaner,nos kit just arrived, umi lcarb and lca's, panhard bar

400Z28Racer

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.

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"Aerodynamics are for people who can't make horsepower"-Enzo Ferrari

godreject

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

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.

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87Marro

ITs the fuel pump

TA

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

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

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

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.