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[quickstitch]

I have a 2003 Chevrolet Duramax Diesel. It turns over and over and won't start.
Now the manual primer will not tighten when pumped. It is getting fuel to injectors. Loosen bolts and checked

 

[Burn Down]

Welcome. Your in the transmission section of the forum... No biggie, one of the mods will move the thread for you.

I would guess that you have a large fuel leak or bad priming/filter head. You should be able to pump the primer until it won't pump anymore, with the engine off.

What mods do you done to the truck? Did it just die on you or were you working on it and now it doesn't start?