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2004 3500 5.9 does the ECM power the lift pump? If so is it possible just the supply to the lift pump can fail but everything else works. Fuel filter fills but injector pump isn’t getting fuel
 

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2004 3500 5.9 does the ECM power the lift pump? If so is it possible just the supply to the lift pump can fail but everything else works.
Yes

Fuel filter fills but the injector pump isn’t getting fuel.
If the LP is worn out it may not be pushing enough psi.
You need to get a gauge and test lift pump psi. Need about 8-10 psi.
Are you sure the lift pump is running?
Which LP do you have, in the tank or under the hood?
 
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Discussion Starter #3
2004 3500 5.9 does the ECM power the lift pump? If so is it possible just the supply to the lift pump can fail but everything else works.
Yes

Fuel filter fills but the injector pump isn’t getting fuel.
If the LP is worn out it may not be pushing enough psi.
You need to get a gauge and test lift pump psi. Need about 8-10 psi.
Are you sure the lift pump is running?
Which LP do you have, in the tank or under the hood?
It’s on the back of filter bowl it has 151 k miles on it
 

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That many miles most likely it's toast and you can get direct replacement or get the in tank style and then there are the aftermarket choices.
I opted for a direct replacement from Napa with a lifetime replacement.
 
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Discussion Starter #5
That many miles most likely it's toast and you can get direct replacement or get the in tank style and then there are the aftermarket choices.
I opted for a direct replacement from Napa with a lifetime replacement.
I ordered one I’ll see. I’m sure a lot of things are going to be replaced. This truck has been awesome my batteries lasted 10 years I’ve replaced the turbo
 
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