goalieforlife

iTrader: (4)

I cannot find it....and the dealer does not have a diagram to show...they only have tpi diagrams....help me...

goalieforlife

iTrader: (4)

help me ppl...lol

ASE doc

Hey goalie, The fuel pump relay is on the firewall, driver's side, just above the brake booster. It has a large red wire and a large orange wire to it along with small green and white, black and white, and gray wires. The gray wire is the output power to the pump.

Start your testing by verifying power at the red wire. It should be hot at all times. It comes from the fuel pump/ECM fuse by the battery. Then jump between the red wire and gray wire to see if the pump powers up. Now you know the pump and its wiring is okay and that the fuel pump fuse is good. Then verify ground at the black and white wire. Next, attach the tip of your test light(you can use a test lead or a paper clip) to the green and white wire and turn the key on. The light should light for a second or two with key on. Then crank the engine, the light should light while the engine cranks. If these test all check out, you are good to replace the relay.

goalieforlife

iTrader: (4)

thanks...i will look into that

ASE doc

Im sorry. I meant to say just to the right of the brake booster, as you look from the front.

goalieforlife

iTrader: (4)

everything checked out with regards to the power and ground to the pump...the pump cut in and all that...i even changed the fuel filter as it was probably time anyway.... the car started for about a minute and then died again... in left scratching my head.

iroczracer07

iTrader: (2)

Done a fuel pressure check?

goalieforlife

iTrader: (4)

how do u check the pressure?

iroczracer07

iTrader: (2)

Rent a fuel pressure tester from your local auto parts store that will work with tbi. If you have a manual for your car, it will show you how to hook up the tester and guide you through the procedure. Post back with your results

ASE doc

FP is not easy to check on the TBI system. The fuel lines are hard steel. You pretty much need to either need to detach the throttle body to remove the supply line so that you can install an adapter on it. Or you need to detach the bracket that attaches the fuel lines to the upper bell housing bolt at the rear of the motor. However, I totally agree that checking fuel pressure before condemning the fuel pump is absolutely the way to go. The TBI has a pressure regulator spring that tends to crumble, causing a loss of fuel pressure that can make you think the pump is failing. The only way to verify that the pump is bad and that the regulator is okay, once you verify power to the pump, is with a key on pressure test, then an engine cranking pressure test, followed by a dead head pressure test, then a free flow test to verify no obstructions in the system.

goalieforlife

iTrader: (4)

thanks....that crumbling spring could or what happened...i will keep u posted after we check it... will i have to replace the whole regulator? is this spriing visible?

ASE doc

The spring is inside the regulator. Once you detach the fuel lines, only three screws attach the injector pod to the throttle body. Once the pod is removed, the regulator is accessed by removing 4 screws on the cover The spring is inside that cover. You can buy a regulator rebuild kit but the spring you have to purchase separately. Before going to the trouble of finding the spring(there are links to it here on TGO), verify that this is your problem.

goalieforlife

iTrader: (4)

the car is now working....thanks for all ur help

henryd3

iTrader: (128)

What was the problem and the solution?

ASE doc

Yes, please do let us know what the problem and the solution were. This thread will serve as a tech reference for others in the future.

bulletxxx

hey guys i think this may be part of a problem im haveing as well.i had cut the oil pressure switch on my 1992 camaro tbi.the car was running fine b4 i cut the connector off.i rewired the connector and now my fuel pump wont energize.could i have blown a fuse,and if so where is the fp fuse?i only see injec1 injec 2.could the relay somehow have blown? and ive been told there is a 20 fuse by the battery.i dont see 1.im kinnda in a panic here so any help would be great