Cummins/Onan — Change Fuel Filter (Spin-on Type)
Maintenance
From a Cummins/Onan owner's manual covering: 6CTA8.3, CFP83-F10, CFP83-F20, CFP83-F30, CFP83-F40. Check it applies to your exact model before use.
Applies to: Cummins/Onan 6CTA8.3, Cummins/Onan CFP83-F10, Cummins/Onan CFP83-F20, Cummins/Onan CFP83-F30, Cummins/Onan CFP83-F40, Cummins/Onan 6CTA8.3G2 engine, Cummins/Onan 6CTAA8.3G3 engine
Before you start
- Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area.
- Do not open the high-pressure fuel system with the engine running.
Procedure
- Close any OEM fuel valves (if equipped) to prevent fuel from draining or siphoning.
- Clean the area around the fuel filter head and remove the filters.
- Clean the gasket surface of the filter head and replace the o-ring.
- Fill the 10-micron water stripping (suction side) fuel filter with clean fuel.
- Do not fill the 10-micron (pressure side) fuel filter; prime using the fuel lift pump instead.
- Lubricate the o-ring seal with clean lubricating oil.
- Install the filter as specified by the filter manufacturer.
- Open the fuel supply and return valves, if equipped.
- Once the engine is started, slowly increase engine speed while air is purged from the fuel plumbing.
Specs & values
- Do not fill the 10-micron pressure side fuel filter before installation
Full service-parts list: Cummins/Onan CFP83-F10 →, Cummins/Onan CFP83-F20 →, Cummins/Onan CFP83-F30 →, Cummins/Onan CFP83-F40 →
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.