Fuel Pump Problem

[HeavyChevy420]

on my 1994 chevy caprice ive installed a new fuel pump 3 times and they will work for a little while then cut off im tryin to figure out what the problem is...Does anyone know what could be the problem?

[DenisM]

Originally Posted by HeavyChevy420

on my 1994 chevy caprice ive installed a new fuel pump 3 times and they will work for a little while then cut off im tryin to figure out what the problem is...Does anyone know what could be the problem?

usually inside the tank there is a plastic tray designed to stop gas from moving away from the pump on hard turns. sometimes there break away from the bottom of the tank and slosh around inside. is yours still attached? sometimes they move around and slam into the pumps, causing them not to work.

[HeavyChevy420]

everything is in place, but everytime i install a new pump it will work for a little bit then cutoff then ill wait for a few minutes then the pump will cut back on, but once it cuts back on and i have the car runnin for a minute it will cut off, ive replaced the pump three times in the last month thinking they were defective but now i know that its some thing else im going to replace the wiring to see if that helps, after i fix this car im buying another box chevy bubbles are too much trouble

[HLandin]

A few POSSIBLE causes:

Fuel pump relay (relay could be chattering or not staying in, causing the pump to drop out)

Oil presssure sensor?? (I know that if sufficient oil pressure does not build up in the engine while it is starting, it will cause the fuel pump relay to drop out)

Bad wiring (bad wiring can cause intermittent problems)

Wrong pump (not necessarily a bad pump, just not for your application)

Clogged strainer (if your pump runs dry, it will burn itself out)

[HeavyChevy420]

i probably will replace the relay but ive put a new strainer on the fuel pumps every time i changed them and ive gotten the fuel pumps from two different places so i dont think its the wrong pump if all else fails im going to just replace everything that has to do with the fuel pump...thanks for the suggestions i will see what happens next

[Blue Bowtie]

The next time you have the fuel tank out (and you WILL) check all the connectors for the pump circuit. There are three connections right at the in-tank unit itself. The connector at the top of the tank unit actually has two sets of connections, and those are suspect. The connector near the tank is also suspect due to road spray contamination. Grounds are very important.

Electric fuel pumps are very voltage sensitive. Operating at reduced voltage not only reduces output pressure but creates a lot more pump heating. The relay is just one item to check.

[HeavyChevy420]

i checked the relay and fuse and there both good the relay cuts on when i turn the key im bout to replace all the wires and see if that does the trick

[96capricemgr]

Ground in the trunk.