Cummins/Onan — Fuel Filter (Canister Type) Replacement
Maintenance · Fuel filter, canister type
From a Cummins/Onan owner's manual covering: B3.9, B4.5, B5.9. Check it applies to your exact model before use.
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Before you start
- Drain the fuel-water separator into a container and dispose of contents in accordance with local environmental regulations.
Procedure
- Lift up on the filter drain lever to drain fuel for approximately 5 seconds.
- Clean all debris from around the canister lid.
- Remove the filter lid and filter element.
- Install the new element in the canister lid and replace the o-ring.
- Lubricate the o-ring with clean engine oil.
- Place the lid back in the canister by twisting clockwise and hand-tighten the lid.
- Open the bleed screw and operate the hand lever until fuel is free of air, then tighten the bleed screw.
Tools required
- Crescent wrench (if lid can not be removed by hand) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Bleed screw torque 9 N·m [80 in-lb]
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.