On the side of the truck next to the washer bottle. If you have a/c; the one closes to the bottle is the fuel relay and the one close to the back of the headlight is for the a/c.

 

Both a/c and fuel relays are the same; switch out the fuel one with the a/c one and see if its better then you will if you have a bad relay or not.

 

no a/c just going to buy a new one.
also i put a fuel pressure gauge right b4 the fuel filter in the rubber hose.Did i put it in the right spot?

 

Don't know about that one; sorry.

 

I would have put it after the hose, but that should at least tell you what the pump is pushing, the filter could always be plugged up and you will see good fuel pressure.

If the relay contacts are dirty/ corroded the relay wont act good either, if it takes a bit O cranking to start it good chance that the relay is bad or dirty contacts. The oil pressure switch kicks the pump on at 4psi (or should).