Maybe it causes by the following problems:
Fuel System Failure
1.
Air in the fuel system
This is a common problem that a
diesel generator fails to start normally.
Solution: Check whether the fuel oil pipe connector is loose or not, and ensure that the air is cleared from the fuel system. Loosen the bleed screw bolt on the diesel filter, and then use the manual oil pump to pump the fuel until the air bubble is gone.
2.
Fuel Line Obstruction
Solution: Check whether the pipeline is smooth or not.
3.
Fuel Filter Clogging
Solution: Clean the filter or replace the filter element
4.
The Handle Position of Fuel Injection Pump Is Not Correct
Solution: The handle position should be pushed to no-load when starting the diesel generator set. Rotation speed is about 700-900r/min.
5.
Fuel Injector Problem - Little fuel injection or fuel injection is not atomized
Solution: Remove the fuel injector, connect it to the high pressure oil pump, pry the fuel injection pump plunger spring and observe the spray condition. If necessary, wash the injection pump.
6.
Oil Supply Problem - Oil transfer pump doesn't supply oil or the oil supply is brokenly.
Solution: Check whether the oil inlet pipe is leaked or not and the filter screen on the oil inlet pipe connector is blocked or not.
More information at article.
https://www.dieselgeneratortech.com/diesel-generators/why-diesel-generator-fail-to-start.html
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