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i was working on an Isuzu today,with a knock off bosch pump made by zexyl . it had the same problem there is a fuel plunger and barrel under the delivery valve.the plunger or barrel is scored when the plunger comes up it sticks and suddenly no fuel. I could tap it and get it to return but no...

sounds to me like a problem in the pump I would pull it out and have it rebuilt

the injection pump is a bosch p7100, used in lots of equipment 4 b cummins to big john deere sixes. they are a good bullet proof pump with some high delivery rates, that's why the pullers love them so much. The only weakness is the gear to pump connection that can slip. I had a 4b 2 summers...

a good point has been made there is a cover on the front acc drive cover screw it off, on your truck you should have a tach drive on it with an inspection mirror check and see if the nut spins with the gear. the gear mounts to the pump with a taper it takes about 130 ft pounds to torque the nut...

either return issue or stuck fuel rack

crack the fuel lines it will tell you if the rack is moving I'm working on an Isuzu right now with a fuel rack stuck in no fuel.