Cummins/Onan 20W-20 — Bleeding Fuel System
Operation
For the Cummins/Onan 20W-20, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 20W-20, Cummins/Onan RDJF engine
Before you start
- Return priming lever inward (disengaged position) to permit normal pump operation.
Procedure
- Disconnect fuel return line.
- Operate hand priming lever on fuel transfer pump.
- Continue until fuel flowing from return line is free of air bubbles.
- Reconnect the fuel return line.
- If camshaft pump lobe is up, crank engine one revolution to permit hand priming.
Full service-parts list: Cummins/Onan 20W-20 →
Source: Cummins/Onan service 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.