Duramax won't prime.

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.

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.

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

Easy fix and pretty cheap.

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.

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.

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