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1991 silverado Fuel pump

91 chevy

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91 chevy Enthusiast

91 chevy

Posted
Posted

Fuel pump is starting to go out on my truck and I know they can get pretty pricey. Any suggestions on fuel pumps that are cheap but good quality? You know ones that won't go out again in a year or so. Thanks!

 

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diyer2 Senior Enthusiast

diyer2

Posted
Posted

Fuel pump is in the gas tank, $50.00 O'reilly's, I put in GM pumps since you have to drop the fuel tank about a $100.00 I think.

green 788 Enthusiast

green 788

Posted
Posted

There was a tech service bulletin on these fuel pumps which I had not seen.

 

The reason they fail early (according to GM) is the plug connector in the wiring harness doesn't make a good connection, and allows a slight voltage drop to occur, and running the pump on lower than spec'd voltage is what causes it to run overtime, and fail early.

 

I put 2 pumps in my '96 K3500 before knowing this. Two pumps within less than 40,000 miles, mind you. :/ But of course at 9 to 10 mpg the pump is doing more than double the work that most fuel pumps do.

 

One of the pumps that I had fail was a Bosch, which was supposed to be better than OEM. I don't know how long the Delphi lasted that was in there when I got the truck, since the truck was used when I bought it.

 

I then had what was supposed to be the OEM style pump, and it lasted about 20k miles and quit.

 

A friend who runs a garage told me that most fuel pumps really don't fail, the connector that attaches the pump motor to the sending unit and related hardware actually gets corroded and fails to make good connection. He said you can take most "bad" pumps out of the tank, and wire-around that connector, and the pump will run fine.

 

Of course you want to go with a new pump while you have everything opened up. Next time I have to put a pump in (not anytime soon I'm hoping), I'm going to eliminate that plug by hard-wiring it, and sealing the connection with gasoline proof sealer.

 

I did replace the factory wiring harness plug which GM recommends. It's a 3 wire plug, with about 6 inches of wire attached to it. It's only around... FIFTY DOLLARS (what a rip off)...

 

I guess you could hard wire around that plug too, sealing the connections up well, perhaps soldering them first.

 

Good luck with your repair. There are some steps you can take to hopefully make this the last fuel pump you'll need to install.

 

Dan

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