Cummins/Onan — Fuel/Water Separator Element Replacement
Maintenance · Racor fuel filter/water separator
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAQ, Cummins/Onan HDKAR
Before you start
- Leakage of fuel presents the hazard of fire or explosion.
- Keep an ABC type fire extinguisher nearby; be certain there are no ignition sources.
Procedure
- Attach a rubber hose to the drain hose nipple; loosen the vent plug and contamination drain valve until water exits.
- When the element and bowl have drained, tighten the contamination drain valve and vent plug.
- Unscrew the center bolt assembly until the element and bowl can be removed as a unit.
- Unscrew the bowl from the filter and properly discard the filter.
- Clean the bowl, the O-ring and the O-ring channel.
- Lubricate the O-ring with light oil and place it in the O-ring channel.
- Screw the bowl onto the new element (Onan Part Number 149-2577); do not over-tighten.
- Lubricate the element gasket with light oil; thread the element and bowl onto the center bolt assembly.
- Tighten the center bolt assembly with a torque wrench to 65 inch-pounds; clean up any spilled fuel.
Specs & values
- Tighten center bolt assembly to 65 inch-pounds
- Onan Part Number 149-2577
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAQ →, Cummins/Onan HDKAR →
Source: Cummins/Onan owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.