The fuel system of diesel generator sets continuously provides fuel to maintain power during unit operation. Once the fuel system malfunctions, it will affect the normal performance of the diesel generator set's power, and even fail to operate. Here, common faults and maintenance methods of the fuel system of diesel generator sets are shared with everyone, so that everyone can be helpful in repairing fuel system faults.

A: Fault diagnosis and treatment methods for diesel generator sets with normal low speed and short-term high speed, as well as insufficient smoke exhaust

The diesel generator set is in good condition, and the throttle speed can quickly increase, but continuous throttle speed is not easy to increase, making it difficult to operate. If the load is increased during use, the unit cannot run and stops, which is caused by insufficient low-pressure fuel supply. The reason for this is that the diesel filter or oil-water separator is blocked. The low-pressure oil circuit is blocked. Insufficient oil supply from the fuel transfer pump or clogged inlet filter screen. The intake valve of the fuel tank cap is malfunctioning.

The above situations can all cause insufficient fuel pressure in the low-pressure oil chamber of the fuel injection pump, which can only maintain the fuel supply required for small loads. When a large or medium load requires a large amount of oil supply, it cannot be met, resulting in the inability of the unit to operate.

Solution: Check if the intake valve of the fuel tank cap is ineffective. If it fails, it will create a certain degree of vacuum inside the fuel tank, and diesel cannot be sucked out. The existence of this phenomenon is mostly caused by the loss of the fuel tank cap and sealing it with an airtight plastic cloth. Check for any dents in the low-pressure oil pipe and any blockages at the inlet pipe joint filter. If the fuel filter or oil-water separator is not replaced for a long time, it should be replaced in a timely manner. Check if the oil pump is working properly. If the oil supply to the oil pump is insufficient, it should be replaced or repaired in a timely manner.

B: Diagnosis and repair methods for diesel generator sets with normal low speed but no high speed and insufficient smoke exhaust.

The diesel generator set operates well at low speeds, but the speed cannot increase during acceleration, and the operating load is weak, which is caused by insufficient circulating fuel supply. Cause: Improper adjustment of the fuel injection pump resulted in a decrease in fuel supply. The elasticity of the governor spring decreases due to fatigue. When the throttle cable adjusts the stroke, the fuel adjustment rod cannot move forward to the end, resulting in a decrease in the fuel supply of the fuel injection pump and the inability of the diesel generator set to reach the rated speed. The plunger and sleeve of the fuel injection pump, as well as the needle valve and needle valve body of the fuel injector, are severely worn, resulting in an increase in diesel leakage and a relative decrease in fuel supply during pumping. The malfunction of the throttle control lever adjustment causes the throttle lever to not be in place, resulting in insufficient fuel supply at full load.

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