Cummins/Onan 1B Series — Operating on gasoline after gas operation
Operation · Fuel system
For the Cummins/Onan 1B Series, from the Cummins/Onan owner's manual.
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Procedure
- Shut off gas supply.
- Turn float stop screw all the way in until it seats.
- Make sure choke is free to operate.
- Open gasoline shutoff valve.
- Start engine following applicable instructions.
- Carburetor has fixed jets, not adjustable for gasoline.
- If speed/voltage unsteady, adjust governor or clean fixed jets.
Source: Cummins/Onan owner'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.