Cummins/Onan 5.6TGHAA11381C — Setting Gas Supply Pressure
Adjustments · Fuel system / demand regulator
For the Cummins/Onan 5.6TGHAA11381C, from the Cummins/Onan service manual.
Applies to: Cummins/Onan TGHAA
Before you start
- High gas supply pressure can cause gas leaks which can lead to fire and severe personal injury or death.
Procedure
- Close the gas supply shutoff valve.
- Remove the 1/8 inch pipe plug from the regulator test port and connect a manometer (scale range at least 14 inches / 350 mm WC).
- Open the gas shutoff valve and try starting the genset.
- While the genset runs at no load, adjust the gas supply pressure regulator to obtain 11 inches (279 mm) WC.
- If the genset will not start, jumper the fuel solenoid open and then check and adjust pressure.
- Check gas supply pressure under full load; if it drops below minimum the supply piping may be too small.
- Disconnect any jumpers and thread in and tighten the pressure test port plug.
Tools required
- Manometer (at least 14 inch / 350 mm WC) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Natural gas 6-13 inch (152-330 mm) WC
- LPG 9-13 inch (229-330 mm) WC
- Adjust to 11 inches (279 mm) WC at no load
Full service-parts list: Cummins/Onan TGHAA →
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.