2005 Duramax will turn over will not crank! - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 25 (permalink) Old 06-16-2019, 12:01 PM Thread Starter
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2005 Duramax will turn over will not crank!

Hey all, I have a 2005 2500 HD Chevy Duramax, will turn over but will not crank, truck has 139,000 miles on it. My truck been running good, about a month ago, changed the fuel filter. Getting it ready to town my Fifth wheel Rv, got everything ready to go, Truck been running great with no problems, I donít use the Truck much run it on the weekends, As my weekend truck, had some storm damage to my roof at home, and had to move it last weekend for the roofers, truck ran good cranked no problems, ran it all weekend and parked it by My camper, went yesterday to crank it and drive it and put it back In the garage it would not fire off, would turn over, and would not fire up. I been reading here in the forum, from fuel filter head to the cp3-cp4 pump. Have not taken the fuel filter off yet ,and try and new filter yet, see also read about air leaks from filter head. After trying to start I can prime the primer bulb, and maybe pump it 2-3 time max and bulb is hard, have not observed any fuel leaks?

So, now confused, on what direction to go in. Any directions will be wonderful!

All The Best
George
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post #2 of 25 (permalink) Old 06-16-2019, 12:06 PM
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'Leaks' at the filter head, are air leaks as it sucks the fuel thru.
Sometimes you'll see some fuel, but not always.

After pumping the primer to firm, did you try again to fire it off?

How much fuel is in the tank?

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post #3 of 25 (permalink) Old 06-16-2019, 01:03 PM Thread Starter
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Hookíem, yes tried to fire it back off still will not fire up, between 3/4 and 1/2 tank of fuel.
Would you go get a new filter and try?
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post #4 of 25 (permalink) Old 06-16-2019, 01:10 PM
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I would pressurize the tank with a small air blower or compressor. About 3 psi max, check for fuel leaks. If you see it dripping fuel anywhere, thatís where your air leak is. Does the primer get good and hard?
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post #5 of 25 (permalink) Old 06-16-2019, 01:31 PM Thread Starter
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Yes the primer get hard!
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post #6 of 25 (permalink) Old 06-16-2019, 01:48 PM
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Then the next thing to check is with a scanner, and see what your cranking rail pressure is.
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post #7 of 25 (permalink) Old 06-16-2019, 02:22 PM Thread Starter
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How much is it to buy a scanner?, had storm damage to roof, did not know had a high deductible trying to recoup from that and then roofer did not clean up got nails in car tires now the duramax not cranking!
So way in the poor house and trying to go with the cheapest options and then narrow it to the high dollar item that I hope it not!
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post #8 of 25 (permalink) Old 06-16-2019, 03:07 PM Thread Starter
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What should the cranking rail pressure be at what range?
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post #9 of 25 (permalink) Old 06-16-2019, 04:15 PM
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I donít remember exactly but greater than 4 or 5 thousand psi.
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post #10 of 25 (permalink) Old 06-16-2019, 04:36 PM
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I believe 1500 psi to start it and 5,000 psi idling.

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