Cummins/Onan — LPG Purging Procedure
Maintenance · LPG 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 (Propane) is extremely flammable and poisonous; eliminate all ignition sources and provide adequate ventilation.
Procedure
- Open the set-mounted AC circuit breakers and close the shutoff valve at the fuel tank.
- Start and run the generator set until it is out of fuel.
- Crank the set a few times after it stops to make certain it is purged of fuel.
- Slightly open the fuel line (flexible section) at the solenoid valve; allow LP gas to escape slowly.
- Disconnect the fuel supply hose from the carburetor and hold it clear of the set.
- Press and hold the primer button on the regulator to release LP gas from the set fuel system.
- When gas can no longer be heard escaping, reconnect the hose to the carburetor.
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.