Cummins/Onan — LP-Gas (Propane) Purging Procedure
Maintenance · LP gas fuel system
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- LP gas is extremely flammable; eliminate all ignition sources before purging
- Provide adequate ventilation to dissipate LP gas
Procedure
- Close shutoff valve at fuel tank and start generator set.
- Allow set to operate until it runs out of fuel.
- Crank set a few times after it stops to complete purging.
- If set cannot be operated, move RV to well-ventilated outdoor location.
- Disconnect vehicle and generator set negative battery cables.
- Close fuel shutoff valves at tank and at each appliance.
- Slightly open fuel line at solenoid valve to slowly release LP gas.
- Press primer button on regulator until no more gas escapes, then reconnect hose.
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.