If you work by yourself you need to make up some long test leads for you VOM so you can take readings while sitting in the drivers seat. I have some 25 footers in the shop for just such occasions.
I agree with Jerry...your engine failing to turn over has nothing to do with the fuel system, it's an electrical issue.
Next time it happens, slide under the truck and see if the starter motor is HOT...maybe you starter is hanging up on the flywheel and staying engaged...just a thought.
Mike B
