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Open Roads Forum  >  Tow Vehicles

 > Duramax won't prime.

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Beaker

Brevard, NC

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Posted: 06/12/20 08:12pm Link  |  Quote  |  Print  |  Notify Moderator

2008 Duramax
Went to start truck, took a second or two longer than usual and only ran for a couple of seconds. Will not prime. Fuel filter changed about 2 months ago but only about 100 miles since then.
Coincidence?


2008 Silverado 2500HD Duramax
2010 Cruiser 26RK

KD4UPL

Swoope, VA

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Posted: 06/12/20 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

Did you tighten the filter down? Is the bleed screw on the filter housing tight?
Is the water drain on the bottom closed tightly?

mtofell1

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Posted: 06/12/20 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

Not sure if it's the same as my 06 but are you sure it's a priming problem and not some other fuel delivery thing (or, I suppose "prime" could just mean getting fuel)? You could check by releasing the bleeder screw and pumping like you're priming a new filter - if fuel squirts out right away you know you have fuel that far. If the truck ran fine for 100 miles after the filter change I doubt that's the problem. 100 miles in 2 months you could have bad fuel. Lots of possibilities.

SweetLou

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Posted: 06/12/20 09:29pm Link  |  Quote  |  Print  |  Notify Moderator

I once had an '87 Ford 6.9 and when I had priming issues, I put an electric fuel pump on it so I didn't have to crank the motor. Got fuel to the pump and off we went.


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Turtle n Peeps

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Posted: 06/12/20 09:42pm Link  |  Quote  |  Print  |  Notify Moderator

I'd bet $5 that this is your problem.

Easy fix and pretty cheap.


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killerbee

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Posted: 06/12/20 09:43pm Link  |  Quote  |  Print  |  Notify Moderator

If this happened within an hour of shutting down the motor on a hot day, it is a prime issue. Specifically it is diesel vapor forming in the hot filter and line. Just continue to pump, then try to start. Repeat until all the bubbles are out. This will be easier if you leave the hood up for an hour or 2, but can be done when hot.


Michael, Systems Engineer and Professional DURAMAX Diesel Tuner
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Beaker

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Posted: 06/12/20 09:55pm Link  |  Quote  |  Print  |  Notify Moderator

motofell1 wrote:

You could check by releasing the bleeder screw and pumping like you're priming a new filter - if fuel squirts out right away you know you have fuel that far


Yes, that what I mean won't prime, cannot get fuel to squirt out.
Ran fine when I shut it off a week ago.

Chinolbz

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Posted: 06/12/20 11:11pm Link  |  Quote  |  Print  |  Notify Moderator

x2 on the filter head failure.

Grit dog

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Posted: 06/13/20 12:04pm Link  |  Quote  |  Print  |  Notify Moderator

Primer is known to suck air. Like the videos posted.
One way to prime it without Using the primer Is to pressurize the fuel tank, slightly.
Seal up an air hose to the tank at like 5-10psi. It will prime the system and truck will start. If it doesn’t hold then either the primer or bleeder is sucking air likely.


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

davisenvy

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Posted: 06/14/20 04:30am Link  |  Quote  |  Print  |  Notify Moderator

There's an o ring under the primer bulb that goes bad. It won't allow you to prime your fuel and won't let your truck to start. The o ring is $10 at your local auto parts store. Good luck.


2006 GMC Sierra 2500HD SLT,4x4,Crew, Duramax EFI Live
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