I've done a few fuel pumps on those trucks. If you don't have a fuel pressure gauge carry a can of carb cleaner or starting fluid with you. When it acts up and won't start spray a little into the throttle body and it if starts then dies it is most likely related to the fuel pump.
Sometimes a good smack to the bottom of the fuel tank will get the pump moving again. We've had trucks towed in that wont start and I've gotten them started after hitting the tank.
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