camaro 22

i think it's an electrical problem, but have have to crank my car at least 3-5 times before the fuel comes out the injectors. i notice that my oil pressure will build up while cranking, then it'll spit out the fuel, then start. i replaced fuel pump relay twice just to make sure that it wasn't bad. i did the fuel filter a few months ago. what could it be?

camaro 22

anyone? anyone?

Omar

How are your injectors?

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

deadbird

Have you watched what the FP is doing during this ?

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Tim Burgess

When the ECM turns on the FP relay for a short periiod of time after the ignition is switched on, does the pump run? If not, does the relay have power from the fusible link at the battery at one contact (orange wire)? Does the relay have power at one side of the coil from the ECM (probably a green white wire)? Ground at the other side of the relay coil (black / white wire)?

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

87LB9B4Z

While I have no solution for you Camaro22, does your ECM give you a code? Mine does! I get a code 54, low voltage - fuel pump circuit. However, it eventually starts... after 5-10 seconds of cranking.

Tim, any thoughts? Sounds like you've been through this drill before. Shall I begin by replacing the fuel pump relay?

This might be the first time Chevy has to work on this puppy. Tracing electrical leads is not something I feel like doing...<G>

blowen90ta

if i were you i would install a new fp relay as some cars use the oil pressure switch in parellel to start the fuel pump in case the relay go's bad(meaning more cranks to start because fp dosent start until oil pressure rises)so if you dont hear it run with just the key on somthings wrong

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hotpowerandperf

Start by adding a jumper to the oil switch wiring. This bypasses the Fuel relay. Does the problem still exist? If it does not then the problem is with the relay. Remove the jumper you are done with it.

You stated that you had replaced the relay already. SO start with wiring.
Pin A fuel pump drive. (green/white) should have power for 10 sec right after key is turned to run.
Pin B to fuel pump should have low resistance and be almost continuous to ground.
Pin C Ground (blk)
Pin D Power 12V Bat (orn)

If the jumper did not help the problem then the problem is with the regulator(bleed down) or the fuel pump (slow start to press or low volume).

HTH

John

Heart of Texas Power and Performance

camaro 22

Tim, where would that fuseable link be for that? i found a 20amp fuse near the battery with an organge and red wire going to it. could that be it. it does start when the oil pressure does build up to like 15-30 psi.

camaro 22

still looking for answers??

camaro 22

ok, a new symtom which may help. when i pull the fuel pump fuse out near the battery the car doesn't start at all. just cranks continuously. now when the fuse is in, it does start after a good bit of long cranks. does this mean the fuel pump is good and that the relay is getting power? this is really bothering me anymore. i really don't have the money to have it diagnoses, but anymore it seems i have no choice. please try to help me out guys. thank you.

deadbird

One thing that will help others (and myself, if I can) help you is some feedback along with your questions.

There are many good recommendations to help you diagnose your problem but, the only clues you have given to what you've treid is that you know the fuel pump is at least working because you've pulled the fuse. I'm not trying to be down out you, I hope you don't take it like that. But, in order to narrow down what might be the problem, you will need to give up some info of what you've tried & what's failed or come up w/no results of helping.

Based on problems I've had, I asked about your fuel pressure, even if the pump is running, it may not be building pressure. This could be a few things but, w/o knowing what the pressure is doing, it's all guesswork.

Other have suggested electrical problems. W/o feedback of if you have tried, no one can get past what they have suggested because you haven't eliminated the suggested fix.

If you don't know quite what you're doing, ask,, we've all had to ask at one point or break it more trying to learn. Most all tools you'll even need, you can rent from Autozone. Give us some input of what you've done, we're all here to help each other (well,, 98% of us anyways...).



[This message has been edited by deadbird (edited October 16, 2001).]

Tim Burgess

Actually, it's not a fusible link - it' the fuel pump fuse near the battery that supplies power the the fuel pump relay & oil pressure switch orange wires - sorry for the confusion.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

camaro 22

i don't know what else to say about it. it cranks til the oil pressure builds up to like 30psi then it starts. i notice that is is not spitting out fuel until this happens as well. i changed the fuel pump fuse near the battery just for the heck of it. it doesn't start at all with the fuse out, does crank, but it does start finally with the fuse in when the oil pressure builds up. and i'll be the first to say that i don't know anything really about cars. i'm just learning as i go, and this site has been a great help and learning experiance for me. so i dont really know what i'm doing with electrical things at all. sorry for any confusion. thank you guys.

shawn

camaro 22

so where do i stand now guys? thank you.

benzmac

I read in the manual that if the fuel pump relay fails, there is a manual switch that will turn on the fuel pump, bypassing the relay after oil pressure builds. The switch is just above the oil filter.

I'd replace the fuel pump relay after checking to see if power is getting to it and then out.

NEEDAZ

You need to follow hotpowerandperf guide and let us know what is happing. If you have replaced the relay twice that is probably not the problem. But it sounds like the wiring at for the relay IS the problem. Go back and read hotpowerandperf suggestions and let use know what you fined. Not a flame, just trying to help.

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Now I HAVE_A_Z
89 IROC 350 TPI