Cummins
No Start – Fuel or Ignition Failure
Generator cranks but does not start (no firing)
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Closed gas shutoff valve or empty diesel tank, Failed ignition coil or spark plugs (gas units), Faulty fuel solenoid, Clogged fuel filters
How to Fix / Troubleshooting
Safety first: Disable automatic start. For gas units, ventilate the area and avoid sparks. For diesel, avoid open flames.
- Fuel supply: Confirm gas shutoff valves are open and that gas pressure is available. For diesel, verify fuel level and that tank valves are open.
- Fuel solenoid: Listen for a click at the fuel shutoff solenoid when attempting to start. If silent, check its fuse and wiring; replace the solenoid if it does not energize with proper voltage.
- Filters: Replace overdue or visibly contaminated Cummins fuel filters and prime the system.
- Ignition (gas): Inspect spark plug leads and coils. Replace worn spark plugs with the correct type and gap.
- Retry start: After corrections, attempt a start and monitor for firing. Persistent no-start conditions may require professional diagnostics.
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Repair Difficulty
Medium
3/5
Required Part
Fuel Shutoff Solenoid
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