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Discussion Starter · #1 ·
So I replaced the fuel filter about 2 weeks ago and when I was going to a buddies it died, primed it back up and it started. Same thing when I left but the bleeder screw broke on me, got a different one and she ran. Went to start it this morning and it won’t start, idk where air is getting in. There’s like this film over the fuel filter but idk if it would have something to do with that
 

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Are you sure your o-ring is seated correctly on the new filter? Might be worth pulling the filter again and inspecting the o-ring. The fact that there is a film on the filter makes me think you either mucked up the o-ring during installation or it was defective.
 

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Discussion Starter · #3 ·
Are you sure your o-ring is seated correctly on the new filter? Might be worth pulling the filter again and inspecting the o-ring. The fact that there is a film on the filter makes me think you either mucked up the o-ring during installation or it was defective.
I know I lubed up the o ring with diesel but I’m gonna pull it off tonight
 

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Discussion Starter · #4 ·
Are you sure your o-ring is seated correctly on the new filter? Might be worth pulling the filter again and inspecting the o-ring. The fact that there is a film on the filter makes me think you either mucked up the o-ring during installation or it was defective.
Pulled off the O ring and it looked great, re primed the system and a lot of air came out so I’m hoping it’s that but now it’s running
 

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You're doing it wrong. Skip the turning of the key. I went through this nonsense with my 2008 for a couple weeks.

1) Open bleeder screw
2) Push primer button repeatedly until you start cursing GM
3) Continue pushing primer button until fuel comes out of bleeder screw
4) VERY IMPORTANT! After fuel comes out bleeder screw, push primer button one more time but DO NOT RELEASE. Hold it down and tighten the bleeder screw.

This was the only method that worked every time for me with my LMM.
 

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Discussion Starter · #8 ·
You're doing it wrong. Skip the turning of the key. I went through this nonsense with my 2008 for a couple weeks.

1) Open bleeder screw
2) Push primer button repeatedly until you start cursing GM
3) Continue pushing primer button until fuel comes out of bleeder screw
4) VERY IMPORTANT! After fuel comes out bleeder screw, push primer button one more time but DO NOT RELEASE. Hold it down and tighten the bleeder screw.

This was the only method that worked every time for me with my LMM.
Ok, I’ll have to try that because I went to pass someone and it died again and the fuel filter was covered in diesel again, possibly the fuel filter housing??
 

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You definitely have a leak if it's covered in diesel fuel. Is your bleeder screw stripped? Maybe grab a new filter and oring just in case. It's a cheap way to check if that's the problem.

After that you might have a bad filter housing. They do go bad, but I don't know that they leak fuel out. Usually it's the internal orings that go bad and cause you to lose prime.
 

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Discussion Starter · #10 ·
You're doing it wrong. Skip the turning of the key. I went through this nonsense with my 2008 for a couple weeks.

1) Open bleeder screw
2) Push primer button repeatedly until you start cursing GM
3) Continue pushing primer button until fuel comes out of bleeder screw
4) VERY IMPORTANT! After fuel comes out bleeder screw, push primer button one more time but DO NOT RELEASE. Hold it down and tighten the bleeder screw.

This was the only method that worked every time for me with my LMM.
Ok, I’ll have to try that because I went to pass someone and it died again and the fuel filter was covered in diesel again, p
You definitely have a leak if it's covered in diesel fuel. Is your bleeder screw stripped? Maybe grab a new filter and oring just in case. It's a cheap way to check if that's the problem.

After that you might have a bad filter housing. They do go bad, but I don't know that they leak fuel out. Usually it's the internal orings that go bad and cause you to lose prime.
i broke the only one and got a new one, I’m gonna look at new fuel filters because the new one is a plastic housing
 

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Probably a dumb question, but you verified the old o-ring came off with the old filter, right?
 

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Discussion Starter · #13 ·
Yeah I did, I put the old O ring on the old filter and last night when I looked I didn’t see an O ring on the housing or filter
I ordered a new filter anyways because the filter on there has like a plastic housing for the filter which maybe is the problem? I didn’t have a problem before til I changed that filter
 

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The diesel gods have blessed me thus far and I've not dealt with a Duramax failed injector. I get rid of them before that time.
 

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Discussion Starter · #17 ·
The diesel gods have blessed me thus far and I've not dealt with a Duramax failed injector. I get rid of them before that time.
Well I have good news! I replaced the filter with a GM one and she rips! I opened her up to make sure because that’s when she has always died and it didn’t die
 

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I have an '03 LB7 and years ago I had issues loosing prime. It was suggested on one of the forums that I replace the filter head with the one from the next generation ('05+?). Had to reroute the hoses because it is not an exact swap, but I've had absolutely no issue since.
 
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