No start - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 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 3 (permalink) Old 01-05-2020, 12:20 PM Thread Starter
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No start

Replaced fuel filter and housing on a 03 drama HD lb7 now it turns over but won't start now if sprayed with starting fluid it will start but won't run checked injectors and bled injectors there getting fuel but still won't start
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post #2 of 3 (permalink) Old 01-05-2020, 10:12 PM
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First, using starting fluid is extremely dangerous. Just a bit too much and the engine will uncontrollably destroy itself.

What does "bled injectors" mean?

Seems like if this started immediately after changing the fuel filter and housing, that's the most likely place for the problem. Not always, but usually. So, I would recheck for any air leaks at the connections, or kinking of the (now very old?) soft fuel lines that attach there. And the fuel filter housing was replaced because?!?? For their age and if it hasn't been changed in a long time (or ever), then it's a good idea. It's also possible to get a bad new one. Does it prime/pump to where it's hard? You opened the bleeder slightly, pumped until diesel bubbled out, closed the bleeder, then pump until it got hard?

2004.5 Silverado 3500 SRW 4x4, D/A (LLY), Ext. Cab, Long Bed
engineer837 aux rad, TxC CAI, LBZ MP, Scangauge II, Nicktane aux filter head, KD lift pump, 2008 PS pump, 2011 hydroboost, Frederico Swaybars, Rancho 9000XL, Torklift StableLoads, BFG AT/KO2, Lance 835 Camper often in the bed.
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post #3 of 3 (permalink) Old 01-06-2020, 10:13 AM
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First thing would be to just make sure your fuel filter is seated properly. On my lb7 all the rubber hoses under the hood were degraded, it is possible that one of yours developed a crack when you were working on it. If you got a lot of air in your hoses from replacing things, the truck might have to crank for an uncomfortable amount of time the first time it starts.
Make sure it's primed properly. Crack the bleeder bolt on the top of the filter head and pump it until pure fuel, not foam comes out. Tighten the bolt and pump it again until its hard. If you can not get the primer pump to get hard, you might have a fuel leak between it and the cp3.
You do not need to bleed injectors on these trucks like old mechanical diesels. Don't loosen any hard fuel lines.

2003 Chevy 2500HD LB7 white extended cab long bed
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