How to Solve the Problem of Insufficient Fuel Supply for the Diesel Generator

Diesel generator sets play an important role in our life. It is a common case that the fuel supply of diesel generator is insufficient. This kind of fault often occurs, especially in the construction site. The main performance is the degree of fuel shortage and the different fault locations. However, the fuel supply is often insufficient in use, and trouble will arise after a long time, Then why does Yuchai diesel generator have insufficient fuel supply? How to solve it? Next, Dingbo Power will provide you with a detailed introduction.

1.Causes of insufficient fuel supply for Yuchai diesel generator.

(1)The problem of insufficient fuel supply caused by the blockage of the main orifice is that the speed of the generator set keeps fluctuating from high to low after starting. The governor swings back and forth regularly, and the machine noise also fluctuates in a rhythmic manner, emitting a whimpering sound. If the choke is turned down, this situation will disappear, but if the speed cannot reach the rated value and the genset power is insufficient, the power cannot be supplied.

(2)The fuel circuit before the main orifice is blocked, resulting in insufficient fuel supply. In addition to the above situations, when the choke is closed, the regular high and low fluctuations will briefly disappear, and soon reappear, and the oscillation amplitude of the governor will increase until the genset stops. Sometimes, there will be the phenomenon of blasting before the shutdown. After the shutdown, wait for a short time, and the genset can start again, and then the fault will repeat, This type of problem is often caused by particulate impurities in the diesel that block the fuel circuit, or diesel adhesive that blocks valve orifices and other areas. It should be noted that this phenomenon can vary depending on the rated power of the genset. The higher the power of the engine, the higher the fuel consumption. After the fuel circuit is blocked, there may be no fluctuation in speed and sudden shutdown.

2. Solution to insufficient fuel supply of diesel generator.

Detailed diagnosis and elimination steps for insufficient or no fuel supply of diesel generator set.

Influence of low-pressure fuel circuit

(1) The influence of the fuel circuit can be seen from the composition of the low-pressure fuel circuit. There are diaphragm pumps, diesel filters, pressure limiting valves, etc. in the low-pressure fuel circuit, and the fuel circuit must be smooth. If there are mechanical impurities in the fuel circuit that are blocked or the fuel pipe is bent, causing the fuel circuit to not flow smoothly, resulting in insufficient fuel supply and even no oil supply.

(2) The purpose of diaphragm pump is to suck out fuel from the fuel tank and raise the necessary pressure to deliver it to the fuel injection pump. The employment principle is that the eccentric wheel in the engine drives the rocker arm of the diaphragm pump to drive the diaphragm to arch left and right, resulting in a change in volume.

The influence of the fuel injection pump is known from its structure and employment principle. The fuel injection pump should supply fuel to the injector on time, in a fixed quantity, and at a constant pressure according to the engine's employment order. The composition of the fuel injection pump mainly consists of a driving organization, a secondary vane pump type fuel delivery pump, a high-pressure pump head, a fuel supply adjustment organization, and an automatic adjustment organization for the fuel supply advance angle.

(1) The vane type fuel transfer pump is used to receive diesel oil output from the diaphragm type oil transfer pump and raise the pressure to deliver it to the low-pressure oil chamber of the fuel injection pump. If the vane type oil transfer pump naturally ages, the pump function ages or is damaged, resulting in insufficient or no fuel supply.

(2) The influence of the fuel quantity adjustment device organization on the fuel injection pump is used to adjust the fuel injection quantity. The mediation principle is that by manipulating the acceleration control lever, a series of transmissions are carried out to cause the oil adjustment sliding sleeve to slide axially on the shaft of the transfer rotor. As it approaches the transfer sleeve, the fuel supply increases. On the contrary, when the pedal is easily accelerated, the fuel volume control slide sleeve and the opposite direction mentioned above will move away from the transfer sleeve, resulting in a decrease in fuel supply.

(3) The effect of boost compensator Some axial contraction transfer pumps do not have a boost compensator. It mainly consists of a diaphragm, spring, valve core, and valve body. Its purpose is to verify the size of the engine's boost pressure, automatically increasing or decreasing the fuel supply to each cylinder, in order to increase the engine's power and fuel economy.

(4) The purpose of the high-pressure pump head is to raise the fuel pressure and supply fuel to the injector for injection. The magnitude of the oil supply volume of its high-pressure pump head is not only related to the organization of oil volume control, but also to the sealing performance of the high-pressure fuel pump itself and the distance of the distribution rotor. If the high-pressure pump head is poorly sealed, the fuel supply of the fuel injection pump will be accompanied by a relatively low level of poor sealing.

Dingbo Power hopes that the above information will help you. If you would like to know more about diesel generator, please contact us by email dingbo@dieselgeneratortech.com .