Question about Chevrolet Caprice

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93 chevy caprice 5.0 new fuel pump changed relay and fuse still can't get pump to work can't even get relay to click checked power to relay and used jump wire to pump prime wire pump works w

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If relay worked when placed in another vehicle you must have a wiring problem. trace wires from fuse block to relay checking for corrosion or short.

Posted on Jan 13, 2013

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  • Chevrolet Master
  • 5,278 Answers

So the relay does have power to it? Try this: pull off the connector at the fuel pump, find the pump wire, and check if it has power when the car is being cranked over. If you have power then, it may be the fuel pump ground that is lost. Find the ground for it and check it-some have a ground on top of tank, some are close by, and some are routed back into the wire harness for a more remote ground. If it's in the wire harness, simply move negative lead of voltmeter to the ground terminal, and positive lead on the pump wire: crank engine, if the voltmeter registers voltage, ground is good. If pump is getting power, but voltmeter shows nothing when negative lead is on the ground terminal, then the ground is lost.
If no power to the pump, the relay may not be getting a signal from the computer to turn it on. One way to check is to pull the relay out, and check for a signal to relay terminal when the car is cranked. Then you would have two terminals showing power, the pump feed terminal, and now the signal from computer. If no signal, check the wire from computer to relay. If you find that signal, the relay may have a bad ground: the coil side of relay has the signal from computer to energize relay, and the other relay terminal from coil side of relay is to ground.
Good luck.

Posted on Jan 13, 2013

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  • Channy Pickett
    Channy Pickett Jan 13, 2013

    i was thinking the computer changed that too but didn't check for power while cranking have to try that in mornin

  • Channy Pickett
    Channy Pickett Jan 13, 2013

    any idea on getting ecm pin indenty for the relay wire i have a green/white stripe wire

  • montehammons Jan 13, 2013

    Sorry, I don't know or have access to that. Maybe the parts department at dealership could copy that page for you. BTW, since you jumped the pump and it worked, that means the pump ground is good, so you don't need to check for fuel pump ground.

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Posted on Jan 02, 2017

csmock132
  • 4669 Answers

SOURCE: 1987 GMC sierra , no fuel pump power.

The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?

Posted on Jun 26, 2009

Centaur89
  • 7 Answers

SOURCE: fuel pump 2000 chevy blazer

Check your connections. did you run the fuel pump wiring under the drivers side door sash like GM did?.. if so check for nicks in the wire or bending or cracks.. this happens.. happened to me. check your fuel pressure. 40 dollar part at an auto store. If its below 59 PSI it wont work. And blazers are very intolerable to low fuel pressure. Also try taking the negative post off your battery for a little while and then putting it back on and if you can get it started again drive around (if its safe and running decent) for at least 30 minutes to get your car computer system acclimated to a new functioning part. Did you check the fuel filter?. rule of thumb when a pump goes change the filter its always the last thing people expect because we all jump to catastrophic engine failure at the first no start moment. lol.
Make sure that all your ducks are in get my drift.. Air oxygen fuel thats the mixture you need to check all those vital parts. before pulling your head off.

Posted on Aug 08, 2008

emissionwiz
  • 75797 Answers

SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.

Sounds like the fuel pump is shorted.

Posted on Nov 03, 2008

  • 393 Answers

SOURCE: Fuel pump relay or emergency engine shut off

something is killing the relays poss fuel pump drawing to much amperage check pump with amp probe is pump noisey?

Posted on Dec 19, 2008

  • 1 Answer

SOURCE: Fuel pump problems

you have a shut off button in the trunk find it turn it off and turn it back on

Posted on Nov 25, 2009

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Sounds like you spent a small fortune on fuel pumps. Don't keep trying to jump it to start. Take the battery off and have it charged up. No further tests will be valid without a fully charged battery.
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Not much help, I know, but proper testing is the only way to find it.. Or just go ahead and change everything till you find it or are broke. Not being snippy, if I can help anymore, post back.

.

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