C 2500 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN J FI (1984)
FIGURE 2 - Fuel Filter/Water Separator
2.
Place a container below the filter drain hose located below the filter (Figure 2).
3.
With the engine off, open water drain valve 2 to 3 turns.
4.
Start engine. Allow it to idle for about 1 to 2 minutes or until clear fuel is observed.
5.
Stop engine and close water drain valve.
6.
Install fuel tank cap.
If the "water in fuel" light comes on again, after driving a short distance or the engine runs rough or stalls, a large amount of water has probably
been pumped into the fuel tank. The fuel tank should be purged. See "Fuel Tank Purge" procedure previously.
Biocides
In warm or humid weather, fungi and/or bacteria may form in diesel fuel if there is water in the fuel. Fungi or bacteria can cause fuel system damage
by plugging the fuel lines, fuel filter, or injection nozzles. They can also cause fuel system corrosion.
If fungi or bacteria have caused your fuel system problems, the fuel system components will have to be cleaned. Then, use a diesel fuel biocide to
sterilize the fuel system (follow the biocide manufacturer's instructions).
Do not use any fuel additive other than a biocide as recommended here. No other fuel additive is recommended.
Cold Weather Operation
