Cummins/Onan 10W30 — Gaseous Fuel System Adjustments
Adjustments · Fuel system (gas mixer / regulators)
For the Cummins/Onan 10W30, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan GGHE, Cummins/Onan GGHF, Cummins/Onan WSG-1068 engine
Before you start
- Fuel is highly flammable and may cause severe personal injury and property damage. Do not allow cigarettes, flame, pilot lights, arcing switches or equipment in area or areas sharing ventilation.
Procedure
- Start the engine and let the set warm up under a partial load (at least 1/4 rated load). Start with natural gas if dual fuel.
- Connect full rated load and turn the power adjust valve two turns counterclockwise.
- Slowly turn the manual fuel valve clockwise (lean) until the engine begins to lose speed.
- Slowly turn counterclockwise (rich) until the engine carries full load smoothly.
- If dual fuel, switch to LPG by closing the manual shutoff valve in the natural gas supply line.
- Reconnect full rated load and turn the LPG flow adjustment valve clockwise until the engine begins to lose speed.
- Slowly turn it back counterclockwise until the engine carries full load smoothly.
Tools required
- exhaust gas analyzer (for emission sensitive areas) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Final fuel/air ratio adjustment should be set using an exhaust gas analyzer in emission sensitive areas.
Full service-parts list: Cummins/Onan GGHE →, Cummins/Onan GGHF →
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.