Specifications

DFP4 2011 Operation Manual
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4. Clean any dirt from the filter carrier sealing surface
5. Apply a light film of oil or diesel fuel to the rubber gasket of new fuel filter
cartridge.
6. Manually screw in the new cartridge until the gasket is flush.
7. Tighten the fuel filter cartridge with another half-turn by hand
8. Open the fuel shut-off valve
9. Check for leaks