Installed a brand new fuel pump in my 04 Chevy Impala started up right away ran fine had it sitting for a few months. now has no power getting to the fuel pump will not start

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when you boost it it run and if you leave it there overnight or a few days you need to boost it again you may
have a light that stay on in the trunk or something like that something is draining the battery if our mechanic cant help go see another on its and electric problem start to check if no light or accessorry stay on hope it a fixya thanks pierre

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DID you put in new gas, fuel treatment, new sock on fuel pump, all new fuel filters, buy inline fuel pressure gauge, check for codes?, this is not a carb where you pour fuel at it , do you have a repair manual for your truck and have you checked troubleshooting guide?

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Before you replace the fuel pump, I would check the cheaiper parts first. Such as fuel filter and injectors.

SOURCE: I have a 1988 Chevy K2500, V8-350 cu. in with TBI.

Oil pressure switch puts power to the pump after it is started.

Pumps also tend to loose their ground with age. I often splice in a new ground at the pump to eliminate that problem area.

Need some votes, thanks

SOURCE: 83 nissan 720 pick-up, fuel

You say you replaced the fuel pump relay switch? The fuel pump relay is located in the passenger compartment on the right side under the dash. Little black box with a 6 pin plug. Replace that and your power to the pump should be restored . Had this happen on mine just last week. The relay actually monitors the alternator, key switch and a couple of fuses and will remove power from the pump if there is a fault. AutoZone stock number is 20550, costs about $50.