Cummins/Onan — Replacing the Fuel Filter
Maintenance · Fuel system
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKBC
Before you start
- Accidental or remote starting can cause severe personal injury or death.
- Diesel fuel is combustible and can cause severe personal injury or death.
Parts for this job
- FS1006 Fuel filter Amazon eBay $29.99 NAPA $90.16
Part numbers from the service-parts list for Cummins/Onan HDKBC. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Let engine cool down to prevent igniting spilled fuel.
- Remove the fuel line from the fuel filter; plug the line.
- Disconnect the negative (–) cable at the battery.
- Disconnect the two fittings at the fuel filter using two flarenut wrenches.
- Remove the filter mounting nut and two bracket mounting screws.
- Remove old fuel filter.
- Loosely secure the bracket to the new fuel filter.
- Loosely secure the new filter and bracket to the base with two screws.
- Reconnect the fuel fittings by hand; tighten one flat past seating.
- Tighten the bracket and mounting screws.
- Prime the engine for at least 1 minute to fill the new filter; check for leaks.
- Tighten connections if necessary.
- Connect the negative (–) cable at the battery.
- Dispose of the old filter per local regulations.
Tools required
- Two flarenut wrenches Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Prime at least 1 minute
- Tighten one flat past seating
Full service-parts list: Cummins/Onan HDKBC →
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.