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Fuel pump keeps blowing fuses

Ive got a 1989 gmc sierre that blows fuses for the fuel pump. Now the weird part is the truck will run but will shut off randomly shut off ( blows fuse) if you about an hour and put a new fuse in it'll start agian and run for so long then blow the fuse. Thought it might be a short some where but not a 100% sure.

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  • 293 Answers

The fuse is designed to protect your wires from melting due to current overload. faulty fuel pumps may use more power before failure, so Cody change your fuel pump and filter, the result will amaze you

Posted on Jan 03, 2014

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6ya6ya
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Posted on Jan 02, 2017

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shaggyrat
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SOURCE: E.E.C fuse keeps blowing in 1991 Ford Explorer

if you replaced fuel pump i would look at backward wiring when replaced and i would start at the source of work if your vehicle was working fine before replacement then 9 out of 10 it will be your fuel pump wireing

sometimes when putting wireing back together the connectors have the missing clip and in turn you can turn the wireing in both directions now where positive is touching the ground on both sides of connector kris kross problem check your work this is crucial use a test light to find the right wires where they go

Posted on May 26, 2008

  • 3 Answers

SOURCE: EFI fuse blows

Grounding the vehicle.

Posted on Jul 06, 2008

davespcr
  • 115 Answers

SOURCE: blows fuses

Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you
MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring
diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!

Posted on Nov 24, 2008

  • 37 Answers

SOURCE: keep blowing fuel pump fuse

replace your ignition modular

Posted on Feb 22, 2009

  • 85 Answers

SOURCE: truck wont start keeps blowing the ecm batt fuse

You have a short (bear wire) somewhere. Trace the wire and find it.
Have a great evening

Posted on May 01, 2009

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Why is the pcm fuse blowing in 2006 gmc yukon replace fuse car starts but shuts off in a few seconds and blows the fuse


https://s14.postimg.org/rsu76mcw1/fuel_pump.jpg

Click on the link.
The only pcm fuse I saw was pcmB fuse. It supplies voltage for both the pcm and fuel pump. Usually you suspect the fuel pump first. Can I guarantee the fuel pump is the problem, no.

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How do I stop my efi fuse from blowing repeatedly. Just changed the fuel pump and now that fuse keeps blowing.


What about your fuel rail regulator, which is in the tank with the fuel pump on some cars? Does it have a pressure switch/sensor that isn't telling the engine control module to shut the pump off when the rail pressure is obtained? If you turn the vehicle to on (not start) and the pump runs more than a couple seconds, like until the fuse blows, it could be either a stuck pump relay or worse, the fuel pump control signal. Pull the pump relay, add a new fuse and see if the pump runs with the key in the on position again, which it shouldn't. If it doesn't run, the issue is either the relay, or the control signal to the relay that is keeping the pump on all the time, causing the fuse to blow.

It sounds to me like the pressure is going to high and stalling or slowing the pump causing excessive current from the motor and blowing the fuse. If that's the case your old pump might not have been the problem. How's the fuel filter? That's in line with the fuel line to the fuel rail?

You don't have to answer the questions, just look into them for your own peace of mind.

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1 Answer

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You have a short to ground or the pump is starting to go bad. You can run a seperate wire from the hot side of the fuse to your pump to see if it is the pump or if you use an ohm meter to check the wire and the pump. Get's a little technical though.

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Fuel pump blowing fuses


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2002 Jeep chrokee


Verify fuse is correct size, then see what you are turning on else when it blows. Fuel pumps are designed to pump up then shut off, until needed when starting and running. It might not be shutting off and staying running when vehicle is not running. Make sure ground circuit is in good shape and positive side as well. Does this blow fuses when you go to start, or does it start and run for awhile then blow?

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