Well it started out as a tune up, New accel wires, bosch fusion plugs and accel ignition coils. (Later found out that it wasn't a firing issue)

I could not hear the fuel pump turning on due to air ride compressor noises and I was assuming that it was running and the car would not start. However I put fuel into intake and car runs, so I KNOW it is a fuel pump issue.

I checked fuse box inside of car, fuse is showing good to fuel pump/injectors. I do have power at INJECTORS but not at fuel pump!?

I checked relay under hood and since there is no way to determine if it is good or not I purchased other one, checked slots where it plugs in and all is showing good.

I pull down gas tank to get to fuel pump and I have NO power going to the golden plate under the rear seats, which results in no power going to fuel pump.

Is there something else I should be checking? I am at a stand still now looking for advice....





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? here when u checked the fuel pump wiring at the sender did you have the key in the ON position.I would assume u did at the time.Being I am no totally knowledge filled with 3rd gens you did check the principle things like the relay etc.Unless the pump has a bad ground at the plate going to the tank it may be a short in the wiring maybe.You could run a wire from the battery positive side to the hot post or hot wire lead to the pump to see if it comes on and if it does that means u have a bad connection somewhere either in a plug or the harness itself.I know that's a long wire u would have to run but ,would help track the issue better looking spec at the harness for the pump rather than replc the pump if it is not the issue.If I am leaving something off or others know better of this issue may they correct my post or add to it .That is where I would start.hope this gives u something to look into.

Yes Ron I did, I read another post that says to change the Ignition switch. I did do that earlier tonight and still no power to the plate. Rechecked the fuses, and relay cleaned with electrical cleaner and both show to be working. I did test the pump with a direct wire earlier today with no results so it could be a bad pump but even if I get another one at the current time I have no power going into the terminal where the pump plugs into.

Open for any further suggestions... thanks for any help you can give.



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I do not have a diagram for the 3rd gens for the wiring.But if the pump did not come on with a hot wire lead which it should have if the pump itself is not faulty that would make me think the pump is toast..I would say check for continuity on the power wire and make sure the wiring is solid b4 buying the pump.I would see if there is a old post or do a search on here for wiring diagrams so u can trace the spec hot wire to make sure the continuity is there if it is I would repl the pump.That's my recomm at this point.

Uh, the PCM only holds the pump on for a short amount of time. THe computer primes the fuel system as soon as the key is turned to the on position, if it does not detect any rpm movement within a few seconds it shuts the fuel pump off. At least, thats how it works with OBD2 gm stuff.

Check the power at relay box. Do you know how to read the diagram on the relay? Check the power supply and ground from the PCM at the relay. Verify the relay is switching. Check the power at the positive side for the fuel pump at the relay box. The power is supplied from a differnt location, not from the main power in on the fuse box. if you actually follow the wires, the positive wire and negative wire for the fuel pump leads to the PCM either way and doesnt hook into the master power for the fuse box. Once again, all I know from heart is OBD2.

Verify you have power at the fuse box. Verify power is leaving the fues box. If you still have no power at the pump, then follow your positive fuel pump wireing.

Oh, by the way. Bosch Fusion plugs, or any of their multi ground electrode plugs are junk. You should have gotten double platnium AC delco plugs. I dunno if the Fusion plugs are double platnium, but you need it because you have a wasted spark ignition system. Sory, just my input...

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I wanted the Denso Iridium plugs like I had in my previous cavalier and they were fine but I opted for the bosch fusion if I made an error so be it. I will rarely be running the car just to and from shows, it is FAR from a daily driver.

I did trace the relay box power at it, trace fuses, power at it.

I did look at the rear plug where the fuel pump plugs into and it seems like the rivets have came un-done. Will this cause fault due to the "golden" colored plug not to have a ground?

I am interested to see what you guys think about this it is too late tonight to test it.

If this is way outside of the box I will start tracing down the Positive power that goes into the golden plug under the rear seat because there is no power at the plug on the "Ignition On" position.




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I sent you a diagram of your fuel system. Something I never thought of was the oil pressure switch. If the PCM detects no oil pressure from the oil sending unit the pump may not energise. Although, no engine has oil pressure while off. Maybe an unhooked wire at the sending unit??

Directly wire up to pump, confirm it comes on, and start the engine

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May seem like a silly question but I never had to do any work with the "oil sending unit" so I do not know where it is located?



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I'm with CheesyPackerFan, hook power up directly to the pump, and try to turn it over. It sounds like exactly the same problem I had in a 94 that was a computer, there was no pump power, so we bypassed it, but it still wasn't getting fuel, because the injectors were controlled by the bum computer. Pouring a little gas down the intake would get it to fire (coil pack is apparently not controlled by the ECU), but it'd die as soon as it ran out. Replaced the computer and she runs great, aside from being VERY cold blooded.

I would agree with cheesy on the oil press sensor theory.I know my first gen does work the same no oil press no fuel to eng. They are tied together wiring wise to the ecm and it is a safety thing for the eng.As for the location on 3rd gens do not know but would bet its on the back of the block like my 85 with a two wire plug the goes to a screw in sensor.U can always go to advance autos website put ur info n about ur car do the search and they do show pics of parts in most cases.At least u would know what to look for part wise.Hope this helps.

I tested power directly to fuel pump with no luck so I went purchase another fuel pump, replaced fired up first crank.

I was puzzled for awile with all the trouble shooting, thanks everyone for the advice they offered.

Back up and running!



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