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Analysis of the Reasons Why the Engine of a Diesel Generator Set Fails to Start Normally
Release time:
2025-09-28
There are many reasons why a diesel generator set engine fails to start. Most of the reasons are as follows:
There are many reasons why a diesel generator set engine fails to start. Most of the reasons are as follows:
No fuel in the fuel tank: The fuel tank is empty and needs to be refueled.
Solution: Fill the fuel tank with fuel.
Poor - quality fuel: The fuel quality is so poor that it cannot support the normal operation of the diesel engine.
Solution: Drain the fuel in the fuel tank, install a new fuel filter element, and add high - quality fuel to the fuel tank.
Dirty fuel filter: The fuel filter is too dirty.
Solution: Replace the fuel filter with a new one.
Broken or dirty fuel pipeline: The fuel pipeline is broken or dirty.
Solution: Clean or replace the fuel pipeline.
Low fuel pressure: The fuel pressure is too low.
Solution: Replace the fuel filter, check whether the fuel transfer pump is working properly. If necessary, install a new fuel transfer pump.
Air in the fuel system: There is air in the fuel system.
Solution: Find out the air - leaking parts in the fuel system and repair them. Remove the air from the fuel system.
Fixed drain valve in the open state: The fixed drain valve is in the open state (insufficient fuel pressure, unable to start the engine).
Solution: Replace the fixed drain valve.
Slow starting speed: The starting speed is slow.
Solution: Check the condition of the battery. If the battery is low - powered, charge the battery. If necessary, replace the battery.
Fuel supply solenoid valve fails to open normally: The fuel supply solenoid valve cannot open normally.
Solution: If the solenoid valve is damaged, replace it. Or check the circuit system and eliminate circuit faults. When starting with a 12V starting system, the starting voltage must not be lower than 10V. For a 24V system, the voltage must not be lower than 18V. If the voltage is lower than the minimum starting voltage, charge the battery or replace the battery.
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