loud fuel pump problems

loud fuel pump problems

Postby turbonick [OP] » November 7th 2008, 9:05am

I have a 96 safari with 30,000 miles. It was in storage for around 8 years so it has very low miles. The owner said he just changed the fuel pump. When I bought it the pump was loud and it would die from time to time when the outside temp was high. I know about Chevy fuel pumps so I changed it. The tank was really bad so I had it cleaned while it was out. Put a new pump in and it was fine. Now it's loud again! I thought it might have a weak ground so I grounded the pump to the chassis and it still dies once or twice a week. Any one out there with the same problem? Am I missing something?
Thanks,
Nick
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Fueling (Empty tank)
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Re: loud fuel pump problems

Postby Matrixx » November 7th 2008, 9:37am

Hi turbonick
Hearing the pump run continuously isn't a good sign at all turbonick. Did you change the fuel filter when you changed the pump? Filters are a "must" change every 3 or 4 months with these vans. Try changing the fuel filter again and see what happens,that would be the cheapest route to go at this point. If it doesn't make any difference then check for good current in the harness leading to the tank (12 Volts for pump - 6 volts for sending unit). Also running the fuel level below 1/4 of a tank doesn't help the pump much either in these vans.

With the 1996 model years, they had a separate system where the the pump was separate from the sending unit. In late 1997 they switched over to the one piece unit which means more money as the sending unit and pump are all in one package. With the 96's as mine it is very important and not well known when replacing the fuel pump, to also replace the wiring harness "inside" the tank. Carter was the only company I could find personally up here that made the harness for these vans. I used a Delphi Pump with a Carter harness and that's what I have now.

Delphi is the only recommendation I have for this application. I went through most of the after market ones before settling with Delphi (AC Delco). This is my 5 th pump in my van because of a bad wiring harness I didn't pick-up on my first pump install, or my 3rd or 4th for that matter, I noticed the bad harness on the 5th pump. Once the pump starts working continuously, it puts a real strain on the wiring harness and will heat it up to a point where the harness will burn or build up resistance in it. When the new pump is installed, it won't get the proper current needed to run the pump at specs and this leads to an early pump failure.

This may or may not be your problem turbonick, but it sure has the trade marks of it. Good trouble shooting will be key here. Hope this helps.
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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Re: loud fuel pump problems

Postby turbonick [OP] » November 9th 2008, 3:06pm

Thanks Matrixx. I think the harness is the problem. I'll look for a replacement one. I kinda figured it was an electrical issue. I grounded the pump and was about to run a new wire from the fuse box to the pump. I didn't think of the harness. Where did you buy yours?
Thanks,
Nick
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Fueling (Empty tank)
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Re: loud fuel pump problems

Postby Gary » November 9th 2008, 3:29pm

I think you'll find the wire harness listed at the N.A.P.A. web site.
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Re: loud fuel pump problems

Postby Matrixx » November 10th 2008, 1:08am

Hi turbonick
I live in Vancouver Canada and bought my harness at Alder Auto Parts. I don't know where you live, so Garys suggestion would be mine as well.
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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