Cummins/Onan — LPG Supply Pressure Adjustment
Adjustments · LPG supply regulator
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- LPG is flammable and explosive and can cause asphyxiation.
Procedure
- Close the gas shutoff valve(s) at the LPG container(s).
- Remove the 1/8 inch pipe plug from the regulator test port and connect a manometer.
- Open the LPG container shutoff valve and try starting the genset.
- While the genset is running, adjust the LPG supply pressure regulator to 11 inches (279 mm) WC.
- If the genset will not start, jumper the fuel solenoid to the battery cable connections so it stays open.
- Check LPG supply pressure under full load.
- Disconnect any jumpers and tighten the pressure test port plug.
Tools required
- Manometer (14 inch / 350 mm WC range) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- LPG supply pressure 9-13 inches (229-330 mm) WC
- Adjust to 11 inches (279 mm) WC
Source: Cummins/Onan service 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.