94touring

Its probably the fuel pump itself. Good time to change the filter too.

DuMaurier 7

Nothing is WRONG with your fpr , thats how they are designed to work , mine does the same thing and its a PAXTON of the same design. Those regulators are normally closed , when the pump starts the fuel pressure pushes it open , whatever pressure you get is based on the spring pressure you put on it with the adjustment screw. The vacuum pressure at idle has little or no effect on it especially on rotarys (lower vacuum , mine is -7"Hg), the reference line and diaphragm are for RAISING the fuel pressure when under boost.

You have another problem , if you have fuel pressure then what you need to look for is your spark (there could be two problems which cause the "lack of spark" , bad coil / wire or no ignition pick up signal to the Haltech) it can even be bad plugs , you just have to check over everything, most times its something very simple.

DevilMotorSports

the FPR is susposed to hold pressure after the system is primed and according to the paper work that came with my Aeromotive it should hold pressure for up to 20 minutes once the system is primed. The problem is that my fuel system isn't holding pressure at all.



Its not that the car won't start, it will, but you have to really pump the gas. Once you get the car started it will not idle unless you've got your foot on the gas. I'd imagine this is do to the lack of fuel pressure. The plugs, coils, and CAS are all fine and working properly.

j9fd3s

well is the fpr bypassing, or do you have some other leak?

9BASE3

Is the pump stock? Maybe you ruptured the line in the tank? My wouldn't start for a while because the fuel pumps were swelling the lines in the tank.. Once I put in the SS Braided line, all was good.

DuMaurier 7

What type of pump and regulator you have ? . I had an A1000 and it never worked like that , I have friends with them and the areomotive FPR's and none of them hold the pressure in the system. Were you runnin the car hard prior to that problem ? , hate to be the one to say it , but if you were and nothing else was changed it could be your motor (I know , similar **** has happened to me !)

DevilMotorSports

i was sitting in the parking lot messing with my haltech maps when the started acting up.



Right now I'm running a stock FD pump, as soon as I get a day off I'm going to go swap it out for my old TII pump.

DuMaurier 7

Now you're saying something differently ......., once you mess with your maps and you screw them up , you would be fouling plugs , hard starting and having idle problems , pull your plugs and check them .

Heath

His plugs did have lots of gas on them since it's running so rich. That's why we thought it could be a stuck injector. We should know more tomorrow afternoon when we try it with the new pump.

DuMaurier 7

OK then , but let us know what happened. Just fwiw , I tried tuning my Haltech for about a year using only a narrow band a/f ratio meter and needless to say I was unsusessfull, one thing I learned though is that the motor is VERY particular with the ratios durind starting and idle , and the plugs foul very easily without an ignition amp. , I kept about four sets of plugs so that I could just swap them out quickly. i Don't think its your pump , once you are getting 30+ psi then its working . Presently my pumps and regulator works exactly like that , after the initial prime the pressure goes back to 0 , when I tumble to start it , it goes back to the preset 39-40 psi.