1994TransAm

how do i know if my pump is bad... i was told to check the relay... but i donno how?

shoebox

Probably easier to unplug the connector on the underside of the car by LH rear seat and see if the gray wire has 12v on it for 2 seconds when you first turn the key on.

HBHRacing

this will show you how to test the system at teh relay

http://mainstreamtopics.com/forum/in...p?showtopic=78




Fuel system electrical diagnostics

First we need to get at the fuel pump relay. here is a picture of it http://shbox.com/1/fuel_pump_relay.jpg *note 93-95 and 96-97 systems are slightly different.

With your test light at the relay test for ground on the black/white wire. Do you ahve a ground?

Yes, contunie to next step
no, repair ground wire.

Next with your test light and the key in the Key on engine off (KOEO) position test for hot into the relay at teh orange or pink wire depending on year. do you have hot?

yes, continue to next step
No, check iner panal and fuse panal fuses and replace any bad fuses and recheck

next check for hot on the Dark Green and white wire while cranking. This is a hot from the PCM to trigger the relay. do you have hot?

yes, continue
no, check wire back to PCM. if still not hot directly out of teh PCM possible faulty PCM.

if you have all hots and ground at teh relay next check the function of the relay itself. do this by checking for hot at the gray Wire with your testlight with the engine cranking. Do you have hot?

yes, relay and wireing is working correctly. veryify battery voltage with a Multi meter
No. unplug relay. with key on engine off use a fused jumper wire to aplly voltage from the pink or orange wire terminal to the gray wire terminal and recheck for hot at the gray wire. if you have hot replace the relay and recheck gray wire with the relay pluged in

Rivas08_02

what do you mean by LH rear seat....thanks bud hopefully this question is silly

Injuneer

LH rear seat means left hand (driver's side of car) rear seat. The fuel pump connector is not inside the passenger compartment, it is, as Shoebox indicates, on the underside of the car above the rear axle.

Courtesy of Shoebox:

Rivas08_02

How would i get direct power to the fuel pump? I dissconnected the fuel lines. And i turn the igniton on and it does no squirt any fuel out. Is that a sign of a bad fuel pump or am i missing something??

Injuneer

To test the fuel pump directly with 12 volts, bypassing the relay, connect 12 volts to the fuel pump prime connector, near the computer.

You also need to tell us about your car - year, model engine, and trans type. Not all these cars are identical.

Rivas08_02

1996 Camaro Z28 5.7 Automatic trans . I just just recently purchased the car and the man i bought it off of had it sitting for 2years. He couldnt get it to start so im starting with the fuel first. Then so on and so

Injuneer

https://www.camaroz28.com/forums/lt1...nature-879835/

Rivas08_02

I just joined the sight im.still learning ....

Rivas08_02

Signature is done

Rivas08_02

Do i get the 12volts from the car battery???