Cummins/Onan — Priming the Fuel System - High Pressure
Maintenance
From a Cummins/Onan operator's manual covering: C121, DL4, DL6, DL6T, ES1178, FB2, L423, LS1629, TI0. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T, Cummins/Onan L423D engine, Cummins/Onan L634D engine, Cummins/Onan L634T engine
Before you start
- Discharge pressure can penetrate skin causing blood poisoning
Procedure
- Loosen fuel injection line connecting nut attaching each line to nozzle holder
- Energize starting motor via Start/Stop/Remote switch in Run position
- After 30 seconds, place switch in Stop position, pause 2 minutes for starter to cool
- Discontinue priming when fuel flows from all high pressure lines
- Tighten connection nuts to 18 ft-lbs (24 N-m) torque
Specs & values
- Torque 18 ft-lbs (24 N-m)
Full service-parts list: Cummins/Onan DL6 →
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.