Engine Tune-up and Performance Checks for 1998 W 3500 L4-39L DSL
Fuel Filter: Procedures
DRAINING THE PRE-FUEL FILTER
1. Loosen the air intake plug (15) and drain plug (2) by turning them counterclockwise (figures 6 and 8).
2. Drain approximately 0.1 liters (3.4 oz) of water.
3. Securely tighten the drain plug and air intake plug.
4. Operate the primer pump on the fuel pump to bleed the fuel system.
5. Start the engine and check to be sure no fuel is leaking from the drain plug.
