No fault but still doesn't run
 

No run and no fault
So I'm looking at a 99 2wd auto with recent transwork new tires and a new lift pump the owner says it was driving down he highway and died then he had it towed to his house and there it has sat for the last 6 months batteries are dead as can be so I put other batteries in it to get it to crank. When I hook up a scanner there are no faults to read even after cranking ( I was hoping for something) so now I have a truck that I know ran like a champ right up till I didn't ( like most) but have no direction for trouble shooting. I would like to say its the injection pump since the lift pump was recently replaced but have no solid evidence pointing that direction otherwise. Any thing I can test? Wil a truck start and idle even with a bad tps? any help is appreciated
:s:

Are you getting fuel to the injectors?

My truck did that. I ended up cracking a couple injection lines open and bled them. In a couple minutes the truck was running again. No codes, you can crank all day but truck will never start until air is out of the lines.

Bleed the system and then if its still not starting standalone the injection pump to rule out possible ecm/pcm issues before even considering pump replacement.

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