Cummins/Onan — Purging Fuel System (LPG)
Maintenance · LPG fuel system
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan NHEL
Before you start
- Liquid LP gas presents a hazard of fire or explosion that can result in severe personal injury or death. Eliminate all sources of ignition and provide adequate ventilation before purging the fuel system.
Procedure
- Close the shutoff valve at the fuel tank.
- Start the generator set and run until it runs out of fuel.
- Crank the engine a few times after it stops to make sure it is completely purged of fuel.
- Move the recreational vehicle to a well-ventilated location away from any ignition source.
- Remove the vehicle negative (-) battery ground cable and the generator set negative (-) ground cable.
- Close the fuel shutoff valves at the tank for both the generator set and appliance fuel supply systems, and at each appliance.
- Slightly open the flexible section of fuel line at the solenoid valve to allow 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 no more gas can be heard escaping, reconnect the hose to the carburetor.
Full service-parts list: Cummins/Onan NHEL →
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.