If you lose power, have 216 code, and the pedal isn't doing anything... good chance pump. Had a pump that would give a dead pedal issue. Went to drive to lunch one day and truck idled great, had no power and would run horrible up top. Confirmed APPS was good when I sent it to Jory (4X4Dually).
If you have a known spare, good, pump. Try that. They are easy enough to change out.
Side note: Verify fuel pressure. Good, solid, fuel volume and pressure is key for the VP44.