Cummins/Onan — Priming High Pressure Fuel System
Maintenance
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DGAB, Cummins/Onan DGAC, Cummins/Onan DGAD, Cummins/Onan DGAE, Cummins/Onan 4A2.3 engine, Cummins/Onan 6A3.4 engine, Cummins/Onan 6AT3.4 engine
Before you start
- Keep hands away from spray; discharge pressure can penetrate skin and cause blood poisoning or serious skin infection.
Procedure
- Loosen fuel injection line connecting nut at each nozzle holder.
- Energize starting motor by placing Run/Stop/Remote switch in RUN.
- After 30 seconds, place switch in STOP and pause two minutes to cool starter.
- When fuel flows from all high pressure lines, tighten connection nuts to 18 ft-lbs (24 N·m).
Specs & values
- Fuel injection line connection nut torque: 18 ft-lbs (24 N·m)
Full service-parts list: Cummins/Onan DGAB →, Cummins/Onan DGAC →, Cummins/Onan DGAD →, Cummins/Onan DGAE →
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.