Several years ago I had to replace the fuel pump - truck had about 100,000 miles. Within the last 4 - 5 months I have replaced the fuel pump twice and just today (about two months since the last replacement), the fuel pump has failed again. That has been the pattern now for the last several months…

You don’t allow the fuel tank to run down to almost empty, do you? Tester

I had repeated failures with GM fuel pumps also, to the point where if I had them start again I would trade cars. But you have to replace the wire harness too and also the relay at the same time. Wires also get old and I replaced the wiring all the way from the pump to the computer. Keeping a hal…

Just a couple of questions for @wcsmith : Have you been replacing the canister fuel filter (not referring to the sock on the pump itself)? A partially clogged filter can cause tremendous back pressure at the fuel pump which can cause early pump failure. Have you been using original equipment pumps (…

GM trucks of that era are notorious for failed pumps. The best you can get is an original Delco pump exactly like the one that failed. But 100K is not bad. They usually go at 75K. The cheap Chinese replacements die MUCH earlier.

The most likely problem is that the tank is not being cleaned out when the pump is replaced. Have seen this countless times with repeated pump failure. Fine sand is a killer of fuel pumps and you’d be amazed at how much sand you buy every time you gas up.

Which fuel filter is being replaced? The one that attaches to the fuel pump or the external inline filter or both? Also, the external filter is a much finer so any sand which is getting through the internal filter (sock) could clog the external filter.

Never thought of sand but my tank had been replaced. At any rate, the sock filter in the tank is not likely to be able to filter out fine grains of sand but the in line filter needs to be replaced just for warranty purposes. Can’t imagine any shop replacing the pump and not the in-line filter. I …

The pickup screen does not filter that fine of particulates and the filter is after the pump. SOP here at my shop is to wash out and dry tank when replacing pump. Helps keep the comebacks down.

Has the possibility that the pumps are not actually bad been considered? Maybe it’s an intermittent pump control issue, pigtail wiring fault, or whatever. There should be a pump test plug on that truck somewhere. Next time the pump “fails” you might consider running a jumper wire from the hot side …

1997 Chevy Truck V8 fuel pump failure

Maintenance/Repairs

wcsmith August 16, 2016, 4:05pm 7

Shouldn’t the fuel filter stop the sand from getting thru? The fuel filter is being replace along with the fuel pump.

Warren

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1997 Chevy Truck V8 fuel pump failure

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