C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

fuel pump blues

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Old Aug 27, 2004 | 10:39 PM
  #1  
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From: miramar florida
Default fuel pump blues

Went to start the car the other day,no start, fuel pump dead, ran a wire from batt to g terminal in the ADL( bypassing relay) no prss.
took the pump out, and bought another one, installed ran OK went to the store would no start, after a while heard the pump run and started drove home, pulled that one out and took it back to store, got another one did the same thing, it died while idling and will no start up for a while then all of a sudden you have prss. again.
I kept thinking may be this pump are junk, so once again I took the pump out and returned it to the store, and ordered a carter, while waiting for it to arrive went home took the old one out the trash can tested it ran good, installed and so far it's working good what gives?
any suggestions?
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Old Aug 27, 2004 | 10:44 PM
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Sounds like your problem might be a short, loss wire or something else electrical. I could see getting one new pump that was faulty; but not two. This combined with your last statement about the old one now working fine, tells me it's not the pump. Some else might be able to pin it down better ...
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Old Aug 27, 2004 | 10:46 PM
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Sounds like a loose ground. Have you put a meter to the pump wire when it was in a no-run state?
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Old Aug 27, 2004 | 11:03 PM
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yeah, I suspected a bad ground some where, just got back from a trip I wll check it asap. thanks for the input
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Old Aug 28, 2004 | 11:02 AM
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I got a pump from Racetronix and they include new wiring, relays and the pump, it was a little over $100 the only wiring that they use out of the stock system is the wiring for the fuel gauge. If you are having trouble finding the wiring demons that may be a solution. But you do have to run a wire from your altenator to the back of the car to power the pump. I ran mine under the car and zip tied it the whole way. They do that so you have a more constant voltage, therefore the ability to pump more fuel. But I am very happy with there product, just another option.
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Old Aug 28, 2004 | 12:36 PM
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There are three brass contacts just unde the FP mounting flange. These can become corroded over time and cause FP operational problems.

Clean them with a fine sand paper or emery and polish with contact cleaner.
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Old Aug 28, 2004 | 02:28 PM
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Sounds like a grounding issue.

Art
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Old Aug 28, 2004 | 04:47 PM
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Naw...

It ain't the ground. I had the same exact problem. I really used my Allstate Towing card a lot of a month or so until I saw the melted plug that 65Z01 was talking about. How that little plug handles any current at all is beyond me. I soldered the FP wires right to the male end of that little plug.

I thought about just bypassing that entire connection and running new wires except the tank has to be air tight for the emissions system to work properly. And I just couldn't think of a way that for sure would keep the tank sealed if I drilled a new hole and ran new wires.

BIG JIM
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