K 20 3/4 Ton Pickup 4WD V8-379 6.2L DSL VIN C FI (1982)
TOP VIEW OF PUMP WITH HOUSING COVER REMOVED
CROSS SECTION VIEW OF INJECTION PUMP
4.
Using a flashlight, look between the forward edge of the housing and the governor. The main shaft will be visible below the governor. Where
the main shaft enters the forward edge of the housing, a snap-ring should be visible. The use of a mirror may help to get a better view. Refer
to sketch.
5.
If the snap ring appears to be bent out of the shaft groove rearwards towards the governor, the ring must be replaced.
6.
To replace the snap ring, the injection pump must be removed and should be repaired at an authorized pump repair facility.
7.
If the ring is not bent, the rough idle is due to some other cause such as a fuel line air leak, timing, etc.
