Cummins/Onan 80MDKAL11454B — Priming the Low-Pressure Fuel System
Maintenance
For the Cummins/Onan 80MDKAL11454B, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan MDKAL, Kubota D1005 engine
Before you start
- Depressing the start/stop switch in stop/preheat mode longer than 20 seconds can cause premature failure of the glow plugs.
- Fuel will spray from the vent when the system is primed; provide a way to catch the fuel, wear safety glasses and keep hands and face away.
- Fuel is toxic; dispose of fuel in accordance with local regulations.
- Ignition of fuel can cause serious personal injury or death by fire.
Procedure
- Normally, press the Stop switch in the Stop/Prime position for up to 20 seconds at a time; the fuel transfer pump runs and the injection pump vents internally to the return line.
- If significant air is present: disconnect the fuel return line and connect a hose from the return to a container to catch vented fuel.
- Open the vent screw on the injection pump inlet fitting if a significant amount of air is to be vented.
- If the fuel supply line and/or fuel filter are completely dry, disconnect the lead to the glow plugs and shield the terminal with tape or other insulator.
- Push the start/stop switch to the stop position and hold 20 seconds or until a steady stream of fuel is observed coming from the fuel return connection.
- Release the start/stop switch.
- If the glow plug lead was disconnected, reconnect it.
- Reconnect the fuel return line in its original configuration.
- Start the generator set and check for normal operation; check all lines, valves and filters for leaks.
Specs & values
- Prime in 20-second maximum periods; allow glow plugs to cool for 1 minute before repeating
Full service-parts list: Cummins/Onan MDKAL →, Kubota D1005 engine →
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.