Caterpillar Fuel and injection system

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

Caterpillar Fuel and injection system parts The structure of the Caterpillar 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 Caterpillar (Caterpillar HP pump) is one of the main components of the diesel injection system. Caterpillar 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 Caterpillar 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 Caterpillar filter element is replaced.

The Caterpillar 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 Caterpillar fine filter, heaters of a shroud (overhead) type are used.

The Caterpillar 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 Caterpillar 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 Caterpillar spare parts you can buy online Caterpillar Fuel and injection system parts.

Caterpillar injectors

The diesel Caterpillar injector is one of the main elements of the diesel engine power system. The Caterpillar 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). Caterpillar 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. Caterpillar 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 Caterpillar injector is as follows. A fuel from the fuel tank is supplied to the Caterpillar fuel pump of high pressure (CNT) (Caterpillar injection pump). The supply is provided by a Caterpillar feed pump, which creates a low pressure required to pump fuel through the →

Caterpillar injection pumps

Caterpillar injection pump is one of the main components of the diesel engine injection system. The Caterpillar 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 Caterpillar injectors. The basis of the Caterpillar injection fuel pump is a plunger pair that combines a piston (plunger) and a cylinder (bushing) of a small size. Caterpillar 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 Caterpillar fuel pumps (Caterpillar 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 h →

Caterpillar fuel pumps

In direct injection engines as well as diesel engines, the Caterpillar electric fuel pump is used in the low pressure circuit for pre-supplying fuel to the high-pressure pump - Caterpillar injection pump. The electric Caterpillar 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 Caterpillar 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 Caterpillar 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 Caterpillar gear pump wo →

Caterpillar fuel filters

Caterpillar 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 Caterpillar fuel pump and Caterpillar injectors, due to the destructive effects of particles on important components used in modern injection systems. Caterpillar fuel filters also increase the engine's power, since the less pollutants present in the fuel, the more efficient the combustion. Some Caterpillar 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 Caterpillar fuel filters contain a water sensor connected to the engine →

Caterpillar feed pumps

The Caterpillar 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 Caterpillar 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 Caterpillar feed pump (low pressure fuel pump) is needed to pass fuel through the Caterpillar filters and then inject the fuel into the high-pressure fuel pump - the Caterpillar 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 Caterpillar pumps, as well as original and aftermarket Caterpillar fuel system parts you can buy online. Short list below: →