This applies to basically ALL Cummins PT pumps, AFC or non AFC. If the pump you are working on does not have an AFC....non turbocharged engine....skip over the parts that relate to AFC operation. Thanks Simp, good find! And, this is directly from the Cummins troubleshooting steps.
AND, what the attached does not mention, IF you think you have a pump/engine issue, divide the system in half, engine/truck, by ELIMINATING the chassis. If the engine runs/accelerates fine with a line directly from the engine into a clean bucket of go juice, the issue is on the chassis. Keep in mind, if air is introduced into a PT system, it takes a few...10-15 mins of running...to purge the air from the system. Start it, throttleit a few times and shut it off, let it sit an hour. If it re-starts and runs 1/2 way normal upon re start, the issue is on the chassis.
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