Cummins/Onan — Bleed air from fuel system
Maintenance
From a Cummins/Onan operator's manual covering: 12.5RDJC-518R, 12.5RDJC-53CR, 12.5RDJC-57R, 15.0RDJC-18R, 15.0RDJC-3CR, 15.0RDJC-4R, 15.0RDJC-4XR, 15.0RDJC-5DR, 15.0RDJC-9XR. Check it applies to your exact model before use.
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Before you start
- Crank engine one revolution if the camshaft pump lobe is up, to permit hand priming.
Procedure
- Disconnect the fuel return line.
- Operate the hand priming lever on diaphragm type fuel transfer pump until no air bubbles in fuel flow from the return line fitting.
- Connect the fuel return line.
- Return priming lever to lowest (disengaged) position to permit normal pump operation.
Source: Cummins/Onan operator'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.