Cummins/Onan — Bleeding the High-Pressure Fuel System
Repair & overhaul · high-pressure fuel lines
From a Cummins/Onan operator's manual covering: MDKAD 10, MDKAD 12.5, MDKAE 16, MDKAE 20, MDKAF 20, MDKAF 25. Check it applies to your exact model before use.
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Before you start
- Do not permit any flame, cigarette, pilot light, spark, arcing equipment or switch or other ignition source near the fuel system.
- This procedure should only be performed by a trained diesel mechanic.
Procedure
- Loosen the high pressure fittings at the nozzles.
- Crank the generator set until fuel appears at the loosened fittings.
- Wipe up the fuel leaked out from the system.
- Retorque the fittings to the values shown on Page S-5 of the Engine Service Manual (Onan part number 981-0521).
Specs & values
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.