ElectronicsNeed help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?
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fuel pump relay?? my truck has tbi and the pump will go on if there is oil pressure..(ex: after its shut down and bleeding oil pressure off it stays on) only other thing that gives power is the relay. change that and see what happens.
__________________
1984 Trans Am
385sbc(RIP)/t-5/4.30-9"
1.69-7.44-11.65 @ 116
next up-->383 with mild upgrades
fuel pump relay?? my truck has tbi and the pump will go on if there is oil pressure..(ex: after its shut down and bleeding oil pressure off it stays on) only other thing that gives power is the relay. change that and see what happens.
I never worked on it myself, but her father (mostly auto inclined) worked on it and that didn't work, but knowing that family, he probably changed another relay in that little cluster.
i'm not entirely sure which relay it would be in that corner, have any pics?
cant say for sure since i ripped out my entire wiring harness when i built my car. and i didnt have TBI. but you should be able to find out which one in a repair manual.
but on my truck, there are two relays side by side. one for fuel pump and the other for AC. they should be the same type so just swap the plugs: fuel pump plug to AC relay and AC plug to fuel pump relay. if it still doesnt work, try turning on the AC to completely rule out the relay. if it works, relay is good and problem is elsewhere. most likely the hot lead from the ignition to the fuel pump relay.
i'm not entirely sure which relay it would be in that corner, have any pics?
They all look alike. (yeah, go ahead and call me a racist :roflmao: )
The best way to identify the relay is by the wires. The fuel pump relay will have a thick red wire, thick orange wire, thick tan/white wire, thin black wire, think green/white wire.
When he turns the key, he should feel/hear the relay click for 2 seconds and hear the pump prime. If there is no click, the relay/wiring is likely bad. If he hears the click but no fuel pump, it's likely wiring.
the ECM is suposed to turn on the fuel pump for 30 seconds after key on, if you are not getting this I would say you need a replacement ECM
Just to clarify, the fuel pump prime pulse is 2 seconds.
If the fuel pump doesn't prime, it's not necessarily automatically a bad ECM, it can be a bad relay, bad wire, blown fuse or more. It's better to find the faulty component before wasting lots of money on a new ECM.
Hope this helps.
Lou
__________________ '91 Z28 convertible w/305TPI WC T5 (no more auto)
"Nothing screams more of poor craftsmanship than wrinkles in your duct tape!"
