Cummins/Onan — Fuel Filter (Spin-On Type) Replacement
Maintenance · Fuel filter, spin-on 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
- Mechanical overtightening will distort threads, filter element seal, or filter can.
Procedure
- Use the filter drain valve to drain fuel out of the filter for approximately 5 seconds.
- Clean the area around the fuel filter head.
- Remove the fuel filter.
- Lubricate the o-ring seal with clean lubricating oil.
- Install the filter as specified by the filter manufacturer.
- Open the bleed screw and operate the hand lever until fuel is free of air, then tighten the bleed screw.
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.