Cummins/Onan — Connect LPG Fuel System
Installation
From a Cummins/Onan service manual covering: 5.5 HGJAA, 5.5 HGJAB, 6.5 HGJAA, 6.5 HGJAB, 7.0 HGJAA, 7.0 HGJAB. Check it applies to your exact model before use.
Applies to: Cummins/Onan HGJAA, Cummins/Onan HGJAB
Before you start
- LPG is flammable and explosive and can cause asphyxiation.
- Testing for gas leaks with a flame can cause a fire or explosion.
Procedure
- Adjust gas supply pressure at gas inlet of pressure regulator to at least 229 mm (9 in) WC; must not exceed 330 mm (13 in) WC.
- Route LPG fuel lines away from electrical wiring and hot engine exhaust components.
- Route the LPG vent hose so that it vents to the outside or provide required openings.
- For long runs use seamless steel tubing with flared ends; flexible hose at fuel tank and generator set.
- Use 3/8 inch I.D. fuel line for runs up to 0.9 m (3 ft) and 1/2 inch I.D. up to 4.6 m (15 ft).
Tools required
- Soap bubble leak test method Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- LPG vapor connection pressure 3/8-18 NPTF 228-330 mm (9-13 in) WC
- 3/8 in I.D. up to 0.9 m (3 ft) or 1/2 in I.D. up to 4.6 m (15 ft)
Full service-parts list: Cummins/Onan HGJAA →, Cummins/Onan HGJAB →
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.