Cummins/Onan 1B Series / 1B Series Plant — Converting from gas to gasoline operation
Operation · fuel system
For the Cummins/Onan 1B Series / 1B Series Plant, from the Cummins/Onan operator's manual.
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Procedure
- Shut off natural gas or butane-propane vapor supply.
- Turn the float stop screw all the way in (clockwise) until it seats.
- Make sure choke is free to operate.
- Open the gasoline shutoff valve.
- Start engine following applicable instructions. Carburetor has fixed jets and is not adjustable for gasoline 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.