MTU Onsite Energy
No Start Without Logged Fault
Generator cranks but will not start, no error code displayed
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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
Air in fuel system, Weak batteries causing low cranking speed, Fuel solenoid not energizing, Blocked fuel supply line
How to Fix / Troubleshooting
Safety first: Disable automatic start and avoid excessive cranking to prevent starter damage.
- Verify cranking speed: Ensure the engine is turning fast enough. Test batteries and clean/tighten all DC connections.
- Check fuel solenoid: During crank, confirm that the fuel shutoff solenoid or actuator is moving to the run position. If not, check its fuse, relay, and wiring.
- Bleed fuel system: If the system has been opened or fuel has run out, bleed air from the fuel lines and filters using the MTU-specified procedure.
- Inspect fuel supply: Confirm that tank valves are open and that there are no kinks or blockages in the fuel line.
- Attempt restart: After corrections, perform a short crank test. If the engine still will not start and no code appears, further diagnosis of injection and compression is required by an MTU technician.
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Repair Difficulty
Medium
3/5
Required Part
Fuel Shutoff Solenoid
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