Cummins/Onan — Replacing the Fuel Filter Element
Maintenance · Fuel filter (water-separator type)
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA
Before you start
- Keep dirt, water and other contaminants from entering the fuel system.
Parts for this job
- 7000037500 Fuel filter Amazon eBay KuduParts $10.00
Part numbers from the service-parts list for Cummins/Onan HDKA. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Drain the filter by removing the plug (Figure 10), collecting the water and sediment (about 1/2 cup [120 ml]) in a suitable container and disposing of properly.
- Reinstall the plug securely.
- Spin off the element.
- Clean the contact surface of the base.
- Lubricate the new element and its gasket, and fill the element with clean diesel fuel.
- Spin the new element onto the base and hand tighten.
- Start and run the genset and check for fuel leakage; tighten the filter only enough to stop leakage.
- See Priming the Fuel System if the genset does not start.
Tools required
- Container for drained water and sediment Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Drain about 1/2 cup (120 ml) of water and sediment
Full service-parts list: Cummins/Onan HDKA →
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.