1988 W150 Here.s the problem.Truck starts fine when cold runs great,but it quits after driving it for awhile.I am getting 14psi fuel pressure at throttle body when running.Once it quits I have to let it set for a couple of hours then pore some fuel into throttle body to get it started again.It sounds like it.s vapor locking,but I just don.t get it. Any advice would be appreciated.
T Rushing

 

Have you checked computer codes. Does it still have spark when this happens. Let us know. newtjr

 

The problem was with the connection on top of the gas tank. I assumed since the gauge was showing plenty of fuel in the tank the contact was good. Got a friend to help me by turning on the key while I was under the truck to check the pump, it should come on for a couple of seconds when the key is turned nothing. I held down on the connection and tried it again and it came on.Now to figure a way of rewiring the connection.
Thanks for the reply.