1, fuel pressure regulator failure
The oil pressure of the fuel system has a direct effect on the mixture concentration, so it should be inspected first. The method is: firstly, the fuel pressure gauge is plugged into the fuel pipeline, then the engine is started and the fuel pressure is measured. If the fuel pressure is too high, the pressure regulator should be replaced; when the pressure is too low, the oil hose can be clamped, if the fuel pressure rises to normal value, the fuel pressure regulator is damaged, or the fuel oil pump and oil filter can be inspected. After downtime, check the fuel pressure should be kept at the specified value of 5min, otherwise the injector leakage, resulting in mixed gas too thick.
2, fuel pump and fuel filter failures
When the start-up difficulties, the general fuel pump is able to work normally, the problem is that the oil pump filter plugging caused by insufficient intake of fuel or fuel filter is not unblocked caused by inadequate pressure supply system.
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