C 20 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN C FI (1983)
Fuel Filter: Service and Repair
Primary Diesel Filter Replacement
Primary Fuel Filter
NOTE: If it should become necessary to drain water from the fuel tank, also check the primary fuel filter for water. This can be done as follows:
1. Open the petcock on the top of the primary filter housing.
2. Place a drain pan below the filter and open the petcock on the bottom of the drain assembly.
3. When all water is drained from the filter, close the petcock lightly.
NOTE: If filter is completely drained, remove filter and refill with clean diesel fuel to prevent engine stalling.
4. Close upper petcock tightly.
5. Start the engine and let it run briefly. The engine may run roughly for a short time until the air is purged from the system.
6. If engine continues to run roughly, check that both petcocks at the primary filter are closed tightly.
