As my luck has it, I installed my new SCT tune and test drove. No problems. Today no start. Engine cranks but thats it. As I quit trying to start it the egince coughs.... I do hear a whining or "running" sound from the rear of the truck. could this be the fuel pump?

I heard this same noise running all the while I was installing the tune (w key on) never heard this noise before.

any ideas?

Thanks

 

I think the only thing back there that came on the truck is the fuel pump.....

What does your fuel pressure look like?