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2002 olds bravada no power to fuel pump

Checked fuses, relay etc. with pump disconnected there is 9-12 v but when pump is connected there is no voltage

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  • Cars & Trucks Master
  • 21,873 Answers

Are you sure the pump is not using the power ?
What happens if you jumper the relay - does the pump run ?

Posted on Feb 11, 2014

  • Parry Hiuser
    Parry Hiuser Feb 12, 2014

    When I put the pump to direct battery power it runs...brand new pump module in it. I am leaning towards PCM, but not wanting to just replace parts.

  •  Stephen
    Stephen Feb 12, 2014

    That didn't really answer my question. The engine computer grounds the pump relay. Is the relay capable of powering the pump or not ?

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Posted on Jan 02, 2017

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  • 230 Answers

SOURCE: No fuel or power to fuel pump.

If the relay is not getting ground signal to turn on then it sounds like a problem with the ECU this is fed from there. Commonly dry solder joints inside the ECU can cause this problem, they have a tendency to crack around the transistors and heavier load components and also components that are subject to mechanical vibration. He said that the fuel pump relay is located in the kick panel and the ECU is next to this. Id take out the ECU and remove the main circuit board and examine for dry solder joints. If you don't know what they look like its somthing like this http://www.tegger.com/hondafaq/mainrelayoperation/dry-joint_small.jpg

Hope this helps

Posted on May 08, 2009

inhisname
  • 76 Answers

SOURCE: No power to fuel pump. main relay replaced and fuses checked under dash

hi tony, i had that same problem come through my shop! i eventualy (hours) found the burnt wire in its clear plastic connector in trunk, above backseat headrest. (top and back of trunk). i hope this helps, so you dont have to do what i did...LOL good luck, marty

Posted on May 27, 2009

bad_dog1
  • 104 Answers

SOURCE: 91 mr2. no power 2 the fuel pump. checked relays

When you say you have checked the relays and fuses i hope you checked to see if they have power getting to them. Besides that The most frequent cause of problems is simply a bad contact in wiring connectors. Always check that connections are secure. Inspect the contacts for bent pins or corroded. You may also want to inspect the ground side of the circuit. If everything checks out then you have a bad fuel pump.

Posted on Jun 25, 2009

joe7379
  • 93 Answers

SOURCE: no voltage to fuel injectors and fuel pump relay

Check for a fusable link. A fuseable link is a wire that blows just like a fuse when overlaoded or tripped. Im not sure where thay are on your vehicle but they commonly are beside the fuse box under the hood or along the back of the fire wall. You have to cut the plastic housuing around them to expose them. I would either pick up a chilton repair book or call the parts dealer to find the exact location.

Joe

Posted on Jun 28, 2009

pippall
  • 1486 Answers

SOURCE: Fuel pump will not work

there is a fuel reset button under the hood with a rubber cover.press it to reset the fuel pump.good luck.

Posted on Jun 28, 2009

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The only way to actually check as you said,which means
using at least a volt meter to me, to do actual voltage checks,
is to have a wiring diagram of the system & circuits your have
problems with

The pump works,so I guess you put battery voltage to it
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No voltage at whatever fuses your at,you now work your way
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Sounds like a corrosion or wiring connection issues, given the
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What I don't see in your question is the main issue
Sounds like you went from the pump back toward the
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I guess you removed & tested the relays (component tested)

Haven't missed much,just have to continue, but can't find &
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