Diagnose this:

[thatK30guy]

Issue: 1996 GMC 1 tone dually crew cad 7.4 L 454, throttle body injection.
Ran fine , came out 3 days latter won't... start, turns over/cranks won't start.
Has good spark
Have replaced fuel pump
have checked relay
getting ready to replace filter under cab between engine and fuel tank.

 

[Hogback Fabrication]

1996 should be Vortec, not TBI?

Any CEL?

 

[79rustyk10]

Don't the ignition switches in those trucks cause all kinds of funky issues when they fail?

 

[thatK30guy]

Thought '97 was first year for BBC Vortec?

 

[Hogback Fabrication]

Thought '97 was first year for BBC Vortec?

Pretty sure it's 96