Fuel Pump Wire Colors? Help! - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 5 (permalink) Old Mar 14th, 01, 10:06 AM Thread Starter
 
Join Date: Mar 2001
Location: Tucson, AZ,USA
Posts: 1
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I THINK I have a bad electric fuel pump. Before I tear apart the entire back end of my car to get to it, I wanted to test the pump by checking for (or placing voltage) on the connector above the rear axle.
There are three wires, BLACK, PURPLE and Dirty white (Gray?). Not sure which two are the pump and which one is the fuel gauge float. My Haynes book is not any help in this case.
THAKS IN ADVANCE FOR ANY HELP!
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post #2 of 5 (permalink) Old Mar 14th, 01, 07:39 PM
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Dale
 
Join Date: Sep 2000
Location: Glendale,AZ.U.S.A.
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The gray is the one.It will only have power for 2 sec. if you turn on the key.Have a friend turn the key,while you're under the car.

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68 z28 ,68 rs 327 ,73 454 vette, 2 goofy kids
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post #3 of 5 (permalink) Old Mar 15th, 01, 10:52 AM
 
Join Date: Mar 2001
Location: Tucson, AZ,USA
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Dale - Thank you! I placed my meter on the Gray and the black wires over the rear axle and just like you said - I got a 2 second pulse of 12 volts then I could hear the fuel pump relay click as it switched off. (The Purple wire must be for the gas gauge float)
The bad news is I did not hear the whirl of the Fuel pump and now I know that it IS getting voltage. I spent the rest of the night tearing virtually the entire back end from my 1991 Camaro RS to remove the gas tank. No Fun, some of the bolts needed to be heated with a propane torch until they would loosen. Had to cut the exhaust pipe too just before the axle and pull it out.
Should finish Sat. Keep you posted.


<BLOCKQUOTE>quote:</font><HR>Originally posted by dale68z:
The gray is the one.It will only have power for 2 sec. if you turn on the key.Have a friend turn the key,while you're under the car.

<HR></BLOCKQUOTE>

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post #4 of 5 (permalink) Old Mar 15th, 01, 05:31 PM
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Dale
 
Join Date: Sep 2000
Location: Glendale,AZ.U.S.A.
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Buy a AC Delco pump,some of the aftermarket pumps dont last.Also,replace your fuel filter and the sock in the tank.The biggest killer of GM fuel pumps,is a restricted/plugged filter.Remember,that filter sees alot of fuel,over half of the fuel that goes thru it,gets returned to the tank.Is your car rusty? Be careful with the fuel line fittings,use lots of WD40.

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68 z28 ,68 rs 327 ,73 454 vette, 2 goofy kids
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post #5 of 5 (permalink) Old Mar 17th, 01, 07:08 PM
 
Join Date: Mar 2001
Location: Tucson, AZ,USA
Posts: 2
Thumbs up

Dale,
Thanks!

Everything is working again. Just for the sake of anyone else who may have to do this I should add a few comments. The Wires to the Fuel Pump are GRAY (+) and BLACK (-). I measured the bad pump and found no continuity (infinity Ohms, where the new pump measured about 1.8 ohms on my meter).

I did as you said - changed the fuel filter by the rear axle and the "sock" or strainer in the tank - Both were in DIRE need of changing. The Stainer was near rotting and the gas in the tank side of the filter was black.

The WD-40 or Rust Buster was a great tip - The tank was very difficult to get out even with the rear assemble all apart and lowered. All the bolts were very hard to get off and it seemed like I needed a DIFFERENT size socket for EACH bolt.

One tip I would have - Jack stands on each side JUST behind the moving parts of the rear end and a hydralic jack under the rear differential. Lots and lots of WD-40 on everything.

I would like to find the engineer that put the Fuel Pump in the tank so that I could give him a swift kick in the @##.

Anyhow after about 8 hours of hard labor and $90 later it's running like a top! Thanks so much for your support - this is a great forum. Hope this helps others.


[This message has been edited by dkester (edited 03-17-2001).]
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