I just bought a 1997 1500 pickup with 4.3vortek was a company truck and it would run fine but then one day it just quit running we figured fuel pump because you would not hear it come on then i crawled under and moved the wires on top of the fuel tank then turned the key back on and herd the pump come on . got the truck home and everything fine and then later i went to start it and the pump didnt come on i dont know if it is the pump which was i believe was recently replaced or maby a bad wire somewhere?
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Re: possible fuel pump problem
Sounds like either pump/wiring, or connector on top of the pump unit. My best advice would be to drop the tank and check for voltage at the fuel pump wires (power and ground) for a short period of time when you turn the key on (Gray wire/ black wire on the 4 pin connector) If you moved the wires and it worked it definitely points to a bad wire close to the tank or loose connection on top of the tank.
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Found on a '92 Toyota pickup w/V6, a bad/intermittent fuel pump relay.
Had fuel rail pressure so fooled us initially, found by listening to pump run then quit, cycle key and pump would run again then quit, sometimes when trying to start, motor would start and run for a few seconds then quit, or not start at all, this created by intermittent relay operation. Need two people, one at passenger side by tank and other to work ignition switch.
Relay located behind right, passenger kick panel, dealer item I believe about $28.00.
Just another possibility.
Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.
If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.
Are you sure there is fuel in the tank (you may have run out or someone - a thief - may have syphoned it without your knowledge). If the fuel pump is electrically operated then when you first turn the ignition key on you should hear the fuel pump whirring for a couple of seconds as it primes the fuel system (if you don't hear the pump operating in this way then it is possible that either the fuel pump fuse has failed, there is a loose connector or a faulty fuel pump). Check also that the earth connections are sound. It could also be kinked fuel hose (unlikely but possible) between the fuel tank and the filter.
You most likely have a bad wiring issue on top of the fuel tank sending unit/fuel pump holder bracket. A replacement of this unit will be necessary to rectify your condition; I change these quite often; a very common failure, with exactly the symptom you describe.
You will either need to drop the tank (hard), or remove the bed (easier) to replace the unit.
i suspect a fuel pump malfunction. i would check there first. make sure the fuel **** fuse is good and well. check the lines for blockages. after you run the fuel pump/fuse/line test, go to the distributor/coil and test the spark value. i would also check wires as well. your problem should be in one of these specific areas.
Chevy Trucks, Blazers, S10 pickup and the like will vapor lock ecspecially the 2000 models. Do not tighten the gas cap past 1 click. There is a tube that runs from the top of the tank down and this gets hot and collapses or burns in half. We just bought a reinforced rubber tube cut it to lengh and use it instead of part and it's worked grat for 2 years so far.