well right off the get go 30 psi is too low. at start up it should be somewhere around 45 psi and like 37 psi when its running. check gas lines, maybe something to do with the evap canister?? i doubt it though just somewhere to look that might directly affect fuel pressure.
> Body: 1962 Ford Falcon, Tropical Turquoise Blue
> Motor: 1993 Z28 LT1, cc 1.6 rr, LT4 springs, MSD opti, TD's, Tuned by me
> Tranny: 1994 Trans Am T56, fully rebuilt with carbon fiber synchros and viper shift fork, Ram HDX clutch, Hurst shifter
> Rear: '93 10 bolt narrowed 9 inches, 3.23
> Suspension: Granada front suspension, 4 wheel disc brakes, Corvette MC
> All work done by me except for interior
I don't see how it could be the evap canister since there are no pressurized fuel lines there. Maybe a stuck open injector as someone else mentioned, but I don't think that would drop your fuel pressure to 30. Maybe a bad wire to the fuel pump?
I have replaced the pump once with a Delphi pump. I am banking on the chance that it may have been a bad lemon out of the box, ima order another one tomorro and try that. However if it doesnt work with the new fuel regulator ima hit something.....really really hard
I said oil pressure switch because the fuel pump does get a reading from the oil sending unit, if you have a faulty oil pressure switch, sending a false signal of low oil pressure, it will cut off fuel pump pressure..... now.... does it make more sense to you?????
^^ actually I dont think it works that way. I recall the oil pressure sending unit will allow the fuel pump to continue to be powered if it blows the fuse and the car still sees the car has oil pressure.
I understand that it will cut off fuel pump if oil pressure is too low in order to avoid any damage to the engine. So, if its sending a false signal, or if its leaking, it will trigger such action. We fixed a friends car that had a similar problem, he replaced a bunch of stuff, such as fuel pump, relay, opti, module, coil... still his car wouldn't run for too long... untill he replaced the oil sending unit... I am just telling my expierience on a similar situation.
fuel pressure is controlled by the regulator. when you turn the engine off vacum goes to zero which closes the return line. There is a checkvalve in the fuel pump to keep pressure in the rail for the next start up.
Either you have a faulty checkvavle, failed regulator, or leaking injector (s).
you should check the vacum line that attaches to the regulator and see if there is any trace of fuel.
its not electrical so keep your test light in the tool box.
change the fuel filter along the underside of the car
haha i always called the nova a ***** cause i take it out on weekends and beat the hell out of it and then come back and hide it hahaha
My Z machine: http://www.fquick.com/zyalater