I have an 86 with the 6.9idi and i had to reset everything on the pump. i was using 1/4 tank to go 30 miles and very little power. i turned the torque screw in 1/4 turn and my fuel mileage went up and i had more power. so i turned the other screw up 1/4 turn and also the torque screw up to match...
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