lane_change

Well I finally was able to get my car running earlier this week.....it took along time to get it started but she eventually did. It was idling then for approximately 10 minutes but then it began to overheat some so I shut it off.



Well I am trying to get it started again so that I can try and fix my overheating problem but my car won't stay running long enough to try and do anything. Most people won't have this problem, but a few of you with an Aeromotive A1000 FP may be able to help me. I know it does not have a schrader valve on it so fuel pressure is not help constant in the lines once the pump quits running. I can not start my car by letting the pump prime and then starting it. I have to start the car while the pump is priming and then it will stay running anywhere from 1-20 secs. before it dies.



I am running a -10 Feed line into a pair of -8 lines to both rails in parallel. Then a -8 return line from both rails to an SX FPR, and back to the tank via another -8 line. I have no evaporative system on my car, I doubt that matters much, but just in case, I am letting you know.



My question is about fuel pressure and why the car won't stay running. Could I have too low of pressure, too high of pressure, too much fuel coming in via my 750 pri/1680 sec injectors, not enough fuel, etc...? What would cause my car to start only when the pump is priming and only run for a few seconds now.



I don't know what else you need to know about my car, it has a brand new ported motor in it, we have used ATF to start it, we have unflooded it a few times, I am just trying to figure this out and I am sure someone knows what the problem is and possibly how to fix it. I am also running an Aeromotive Fuel Pump Controller.



Thanks,

Scott

toddp31

What computer are you running? I think the fuel pressure should be around 30-40psi. New motors are a bitch to start untill all the seal breakin properly. Have you pull started it? Someone that I know has a Aeromotive A1000, he has to crank the car but not start it too get pressure in the system.

lane_change

I am running an Apex'i Power FC. It is being a complete bitch to start....it is definately fuel related though. The pump won't keep the lines pressurized so I can't start it any other way then to crank while it is priming...it is kind of annoying.



Any A1000 users that can help me out?

93 R1

Do you have the PFC set for 750/1600's?

jspecracer7

I think I know what your problem may be. IGY helped me figure out mine when it did the same thing. I ran 2 in tanks pumps and had one hell of a time keeping the car idling. IGY traced it down to the voltage going to the fuel pump. At idle, the FP is at -6 volts DC. When the gas is pushed down, it switches to -12 vdc(or whatever the alternator is putting out). To remedy this, we put a relay inline with the power wire going to the Fuel pump causing it to always be on at -12 vdc. Soon as the relay was in...car starts everytime.

lane_change

Yes, I have my Power FC set for the 756/1680 injectors.



Here is a layout of the wiring I have for the fuel pump and fuel pump controller.



The pump has a 10g ground and a 10g wire to the fuel pump controller.



The controller has a 10g wire to the pump, a 12g wire to a battery source w/ a 30AMP in-line fuse, a 16g ground, a 16g wire to a relay which spliced into the factory harness at the ECU (so my relay is being used instead of the factory relay), as well as a 16g wire to another relay which is spliced into the factory harness at the ECU (so my relay is being used instead of the factory resistor).



The controller than operates the pump and uses the ECU to control the pump, so it primes just like stock, it switches the current just like stock, and all that jazz.



I know my problem is fuel related....it is just a question of what is the actual problem. Could be fuel pressure, could be fuel pump voltage, could be injector problems, etc....I just need to be able to trace down the problem and fix it. I will check all the voltage today and see if that is my problem.



Thanks for all the help so far....please feel free to help more.

Swervedriver

Do you have a fuel pressure gauge in the system? What's the rail pressure set to?

lane_change

That is kind of a bitch....I have a fuel pressure gauge, but stupidly I placed my FPR against the firewall (which now I know it has to be at least 6" away from the firewall to be NHRA legal, so it needs to move) which keeps me from having a gauge installed while it is running...it hits the manifold. It sucks. But what I did, was powered the pump to stay running while the car was in the on position, removed the UIM and all that, and checked the pressure, we have it set at about 40psi when the pump is just running with the lines full. It really needs to be moved and fixed, that is just ******* dumb, I know, but I don't have enough parts at the moment to move all my lines. I would like to run a fuel line from the gauge port to another spot in the motor so I could monitor it, but I can't find any lines like that. Male on one side, and female on the other, plus the bends would worry me as well.

sub-zero

I would maybe try getting rid of one of those relays. Just use a switch to power up the relay and wire direct to the battery. Unless You are using the Aeromotive fuel pump controller in your setup. If You cant keep enough fuel in the lines at idle You are going to have big problems when Your into some big boost.



Steve

lane_change

I am running the Aeromotive Fuel Pump Controller as well....hence the two relays. One is for the PWR and the other is for the SWT.