Medium and Heavy Trucks
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Does check engine light come on and go off after first turning key on?
Does tach show RPM when cranking engine over?
Have you dropped filters down to see if they are full?
Any cold temps at your location?
I saw you did have ecm checked but wanted to make sure it was powering up right on truck side.
What about tach working during cranking?
I know you said you checked trs and srs but if bull gear walked it won't pick up srs signal tach won't work and no start.
Have you checked fuel pressure? should have at least 20 during cranking. Possible fuel drive problem.
It runs on fuel from starting fluid so we need to eliminate that first,,check engine light works, that tells us since ecm was checked should not be electrical but still possible.
I read wrong, tach does work so we need to make sure you have fuel pressure,if drive is good try running fuel system out of a bucket of clean fuel bypassing everything, go directly to fuel pump inlet into bucket.
prime system and see if it stays running.
Also check return fuel for any air,,possible injector check valve bad allowing fuel to arriate.
Let me know how it goes
One is input from secondary fuel filter head other is return.
Go to back of trans there is usually a fitting for return hose from head before going back to tanks,,sometimes it is a tee so fuel returns to both tanks.
Also return fuel line will have a check valve inline with return hose close by head other won't
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Questions or problems let me know I'm happy to assist.Thank You,spanky