Cummins/Onan 1B Series — Operating on natural, butane, or propane gas
Operation · Fuel system
For the Cummins/Onan 1B Series, from the Cummins/Onan owner's manual.
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Before you start
- Make sure line pressure to regulator does not exceed six ounces per square inch.
Procedure
- Follow codes for fuel pipes and containers.
- Ensure line pressure to regulator does not exceed six ounces per square inch.
- Turn on gas supply and start engine; do not choke or fill carburetor.
- Choke plate must be wide open and locked.
- Set spark plug gap 0.018 inch for gas fuel.
- Adjust gas adjustment valve at air intake for best operation at maximum load.
- Repeat adjustment after normal operating temperature.
- Adjust governor spring nut if speed/voltage high.
Specs & values
- Spark plug gap 0.018 inch
- Line pressure not over six ounces per square inch
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.