Doosan Fuel and injection system

The Doosan fuel system is designed to supply the Doosan engine with fuel, as well as its storage and cleaning.

Doosan Fuel and injection system parts The structure of the Doosan fuel system includes a fuel tank, a fuel pump, a fuel filter, an injection system that are connected in series by fuel lines.

The high-pressure fuel pump Doosan (Doosan HP pump) is one of the main components of the diesel injection system. Doosan Pump, performs, as a rule, two main functions: injection under pressure of a certain amount of fuel; regulation of the required timing of the injection. With the advent of battery-operated injection systems, the injection timing control function is assigned to electronically controlled injectors.

The incoming fuel is cleaned in a Doosan fuel filter. The fuel filter of the fuel system of diesel engines has a pressure reducing valve that regulates the working pressure in the system. Excess fuel is diverted from the valve through the fuel drain line. With a certain periodicity, the fuel filter assembly or, just, the Doosan filter element is replaced.

The Doosan high purity fuel filter is the most vulnerable place in the fuel system, because it is its capacity that is broken due to low temperature. To warm up the Doosan fine filter, heaters of a shroud (overhead) type are used.

The Doosan injection system is designed to form a fuel-air mixture by fuel injection.

The fuel system works as follows. When the ignition is switched on, the fuel pump pumps the fuel into the system. When passing through the fuel filter, it is cleaned. Then the fuel enters the injection system, where the spraying and the formation of the fuel-air mixture occurs.

A feature of diesel fuel is an increase in viscosity with a decrease in temperature, which is accompanied by turbidity, crystallization and further solidification. With a significant increase in viscosity, the normal operation of the fuel system is disrupted, up to the complete cessation of the supply of diesel fuel. To counteract these negative factors on the Doosan Heavy Equipment diesel heaters are used.

Diesel fuel heaters perform, as a rule, two functions:
heating of diesel fuel at engine start-up (preheating);
maintaining a certain temperature of diesel fuel when the engine is running (march heating).

Only in our online Doosan Construction spare parts you can buy online Doosan Fuel and injection system parts.

Doosan injectors

The diesel Doosan injector is one of the main elements of the diesel engine power system. The Doosan injector provides direct fuel supply to the combustion chamber of the engine, as well as metering the supplied fuel at a high frequency (more than 2,000 pulses per minute). Doosan Injector performs an effective spray of fuel in the space above the piston. Fuel as a result of such spraying takes the form of a torch. Doosan injectors of different fuel supply systems have design features and differ in the way they are controlled. The injectors are divided into two groups: mechanical; electromechanical; The principle of operation of the diesel power system with the mechanical control of the Doosan injector is as follows. A fuel from the fuel tank is supplied to the Doosan fuel pump of high pressure (CNT) (Doosan injection pump). The supply is provided by a Doosan feed pump, which creates a low pressure required to pump fuel through the fuel lines. Electromechanical diesel →

Doosan injection pumps

Doosan injection pump is one of the main components of the diesel engine injection system. The Doosan pump, as a rule, performs two main functions: injecting a certain amount of fuel under pressure and regulation of the required timing of the injection. With the advent of battery injection systems, the injection timing control function is placed on electronically controlled Doosan injectors. The basis of the Doosan injection fuel pump is a plunger pair that combines a piston (plunger) and a cylinder (bushing) of a small size. Doosan plunger pair is made of high-quality steel with high precision. Between the plunger and the bushing, a minimum gap is provided - precision mating. Depending on the design, the following types of high-pressure Doosan fuel pumps (Doosan injection pump) are distinguished: in-line, distribution and main. In a series pump, injection of fuel into the cylinder is performed by a separate plunger pair. The distribution pump has one or more plungers, which ensu →

Doosan fuel pumps

In direct injection engines as well as diesel engines, the Doosan electric fuel pump is used in the low pressure circuit for pre-supplying fuel to the high-pressure pump - Doosan injection pump. The electric Doosan fuel pump creates a fuel pressure in the limit of 0.3-0.4 MPa (in engines with direct injection - up to 0.7 MPa). The use of mechanical pumps in Doosan fuel injection systems is not possible due to low fuel delivery pressure. By design, the following types of electric fuel pumps are distinguished: roller, gear and centrifugal. In the Doosan roller pump, the fuel is sucked and injected by rotating the rotor and moving the rollers therein. As the space between the roller and the rotor increases, a vacuum is created, and the fuel fills this space. When the space is full, the fuel supply is cut off. As the rotor rotates, space decreases, the discharge port opens and the fuel leaves the pump under pressure. Similarly, the Doosan gear pump works where the fuel is sucked a →

Doosan fuel filters

Doosan fuel filters serve a vital function for modern vehicles that are sensitive to the quality of motor fuel. Unfiltered fuel may contain several types of contaminants, for example, pieces of paint and dirt that could get into the fuel tank during refueling, or rust caused by moisture in steel tanks. If these substances are not removed before the fuel enters the system, they will lead to rapid wear and damage to the Doosan fuel pump and Doosan injectors, due to the destructive effects of particles on important components used in modern injection systems. Doosan fuel filters also increase the engine's power, since the less pollutants present in the fuel, the more efficient the combustion. Some Doosan filters, especially on diesel engines, have the shape of a cup for collecting water at the bottom. The water can then be drained by opening the valve at the bottom of the bowl. A lot of Doosan fuel filters contain a water sensor connected to the engine control unit or directly to t →

Doosan feed pumps

The Doosan feed pump is a low-pressure fuel pump. The main objective of this device is the function of supplying fuel to a high-pressure fuel pump - the Doosan injection pump. Typically, a feed pump is installed on the injection pump housing or in the immediate vicinity of injection pump. Both pumps are connected by means of fuel pipes, through which fuel is supplied from one pump to another. The Doosan feed pump (low pressure fuel pump) is needed to pass fuel through the Doosan filters and then inject the fuel into the high-pressure fuel pump - the Doosan injection pump. It is worth noting that the feed pump pumps a little more fuel than the engine needs to operate. This swap "with a margin" allows you to maintain the optimum pressure in the fuel system, avoiding increasing loads. All the necessary Doosan pumps, as well as original and aftermarket Doosan fuel system parts you can buy online. PUMP ASSY,FEED - 105207-1520, 105207-1540 PUMP ASSY,FEED - 105210-52 →