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My 07 Colorado wouldn't start ( turns over but wouldn't fire) . I pulled the fuel pump fuse to inspect it then reinstalled it . It cranked right up . this has happened twice now . Why would that be?

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You may have a bad connection at the fuse, you may have a bad fuel pump relay or intermittent, you may have a faulty fuel pump and when you reinstall the fuse it jolts the pump to work, the best thing to do is when it fails you need to get out the old voltmeter and ring out the wires when it fails to find the source of the failure if its from the pump wiring back to the relay, also the PCM or computer will run the fuel pump usually for 3+ seconds to prime the pump before you start the car, maybe the PCM is suspect

Posted on Nov 15, 2014

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Posted on Jan 02, 2017

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emissionwiz
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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

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SOURCE: 2005 colorado , turns over dosent start

This happened on my 06, the first two times i brought it in they said nothing was wrong with it. Well, it kept happening and i noticed that when it did this that the security system light on the dash would blink. 15 mins later i could retry it and it would or wouldnt start right up. Went to the dealership and they had to replace the ignition because it kept engaging the vehicle engine immobilizer.

Posted on Feb 11, 2009

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SOURCE: 1993 Jeep Grand Cherokee Fuel Pump?

Between 100-140 thousand miles the fuel pumps go out on the 1993 cherokee. Its a fact. All parts are manufactured with the knowledge that it will last for a specific period of time then it dies. The relay switch was helpful for a brief while because there was still some juice in that pump, but now that it is gone it is gone.

If you don't see the fuse box under the dash in the driver leg area or beneath the radio check for a covered box under the hood. There should be a fuse spec guide on the lid of the box that tells you where specific wattage should go and for what purpose. But, your fuel pump problem will not be solved by a new fuse.

Posted on May 25, 2009

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SOURCE: 06 Colorado wont start at times

there is a faulty switch in the steering wheel column. My truck did the same thing. Next time check to see if the security light flashes next time it doesn't start. the time delay is more like 10 min.

Posted on Dec 31, 2009

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My car will not start it cranks but will not turn on. So far I have changed the crank sensor I also have no spark to coil packs or spark plugs Fuel pump does not turn on when I turn the key. What is the...


Begin by checking fuses. Ignition, efi, fuel pump fuses. When key turned to on, do the warning lights and gauges work? That verifies switch has power and is sending power out. With key on, the coil primary wire to coil packs should have voltage.

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