I always get the best info from the guys on here. So now i have a new problem. I think that my fuel pump has gone out. I have a 94 F-150 XLT Long bed, with duel tanks. When i was driving home from work it just started acting like i was out of gas whenever i pushed the gas pedal. Then when i let up it would act normal. She's been nickle and dim ing me lately. New sylinoid swich, battery, battery posts and wires, altornator. Now i think she's down for the count. I need a third opinion first.

 

Check the fuel pressure, that will tell you if it is gone or not.
The symptoms usually are, works fine when cooled when the pump heats up it loses pressure and power is lost, it hesitates and or stalls.

 

^^^ What he said hook up a fuel guage and see what shes putting out...

Do you have a single external pump on the fuel rail, or a submersable pump in each tank? If 1 in each tank try switching the tanks to see if it works