Cummins/Onan — Fuel Solenoid Checkout
Testing & diagnosis · Fuel solenoid K1
From a Cummins/Onan service manual covering: MDL3, MDL4, MDL6. Check it applies to your exact model before use.
Applies to: Cummins/Onan MDL3, Cummins/Onan MDL4, Cummins/Onan MDL6
Procedure
- Watch for solenoid actuation when B+ is applied (start switch in start or run position).
- If there is no actuation when B+ is applied, the fuel solenoid must be replaced.
- When B+ is removed, the solenoid must de-activate.
Full service-parts list: Cummins/Onan MDL3 →, Cummins/Onan MDL4 →, Cummins/Onan MDL6 →
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.