Engine Failed All Crank Attempts Without Starting

Common Symptoms

• Operator panel displays fault code 3 and the unit shuts down after repeated crank cycles
• You can hear the starter motor cranking but the engine never fires and run RPM is never reached
• The STOP indicator illuminates or the panel locks out after the last crank attempt
• White or no exhaust smoke at all during cranking on a cold unit
• Fuel solenoid clicks but engine does not sustain combustion
• Unit was in storage and had not been exercised for several weeks or months
• Restarting manually from the panel fails immediately or repeats the same crank-and-shutdown sequence

Probable Causes (Ranked by Likelihood)

• Stale or degraded diesel fuel, common on yard-stored rental units sitting longer than 60 days Very Likely
• Weak or discharged battery unable to sustain adequate cranking speed through all start attempts Very Likely
• Plugged or air-locked fuel filter restricting flow to injection pump Likely
• Air in the fuel system from a run-dry event or loose fuel line fitting Likely
• Stuck or failed fuel shutoff solenoid not opening to allow fuel delivery Possible
• Kubota D902 or D1105 glow plugs failed or not energizing, causing hard no-start in cold conditions Possible
• Injection pump or injector fault preventing adequate fuel atomization Less Likely

Step-by-Step Diagnostic Procedure

1. Check the fuel tank level first. Even a gauge showing partial fuel can be inaccurate on a tilted tower. Confirm visually or with a dip stick.

2. Smell and inspect the fuel. Diesel stored more than 60-90 days in a rental unit can varnish and lose ignition quality. If it smells sour or looks dark and cloudy, drain and refill with fresh fuel before doing anything else.

3. Measure battery voltage with a multimeter at the battery terminals. You want 12.4 V or higher at rest. Below 12.0 V the battery may not be sustaining cranking speed through all programmed attempts. Charge or swap the battery and retry.

4. Check the primary fuel filter and secondary filter if equipped. Remove the primary filter and inspect the bowl for water, sediment, or a clogged element. Replace if it has been more than 500 hours or one year since the last change.

5. Bleed air from the fuel system. Locate the bleed screw on top of the fuel filter housing on the Kubota D902 or D1105. Loosen it slightly, operate the hand primer pump on the fuel filter head until bubble-free fuel weeps out, then re-tighten. On units without a hand primer, crack an injector line fitting slightly at the injection pump outlet, crank briefly, retighten.

6. Locate the fuel shutoff solenoid on the injection pump. With the key in RUN or the controller in MANUAL, you should hear a solid click from the solenoid pulling in. If you hear nothing, measure voltage at the solenoid terminal during a crank attempt. You need 12 V DC present. No voltage points to a wiring or controller issue. Voltage present with no click means a failed solenoid.

7. In cold weather below 40 F, check glow plug operation. Use a 12 V test light or multimeter current clamp on the glow plug bus wire during the preheat cycle. If no current flows, trace the glow plug relay and individual plugs. A failed glow plug on a D902 or D1105 will read close to 0 ohms when good, open circuit when failed.

8. If fuel, battery, air bleed, and solenoid all check out and the unit still will not fire, the injection pump or injectors need a qualified diesel technician with pressure test equipment. Do not continue repeated crank attempts beyond this point as you risk starter damage.

Frequently Asked Questions