秋天喝什么汤最好Fuel Supply System of Gasoline Engine(UNIT SEVEN)
All the gasoline engines have substantially identical fuel systems and run on a mixture consisting of fuel vapor and air. The fuel system compris the units designed to store, clear and deliver fuel, the units intended to clean air and a unit for preparing a mixture from fuel vapor and air.
In a fuel system different components are ud to supply fuel from the fuel tank into the engine cylinder. Some of the important components are fuel tank, fuel pump, fuel filter, carburetor, intake manifold and fuellines or tubes connecting the tank, pump and the carburetor.
男鼠女兔The fuel tank is a fuel container ud for storing fuel. It is made of sheet metal. It is attached to the vehicle frame with metal traps and is located at the rear of the vehicle. They are mounted in a boot or boot-floor pan in ca of front-engined cars and small commercial vehicles. In order to strengthen the tank as well as to prevent surging of fuel when the vehicle rounds a curve of suddenly stops, baffle plates are attached to the inside of the tank.
A cap is ud to clo the filler opening of the tank. The fuel line is attached at or near the bottom of the tank with a filtering element placed at the connection. The other components of the fuel tank are the fuel gauge nding unit, a vent pipe, receiving unit. To prevent the dirt and water from entering the luggage compartment, a aling strip is fitted between the fuel tank and boot floor pan. Moreover to limit the transmission of frame distortion to the tank giving ri to squeaking as the metal parts get rubbed together, rubber or felt pads are often fitted between the mountings and the tank. Provision is also made against drumming of the tank by the mountings. The tank may be placed at the side of the chassis frame for convenience in ca of large commercial vehicles. The length of the connecting lines or tubes from the tank to the 登录英文carburetor is also restricted by this at the same time.
A porous filter is attached to the outlet lines. By drawing fuel from the tank through the filter, any water in the bottom of the tank as well as any dirt into the fuel gathers on the surface of the filter. To keep the fuel always under atmospheric pressure, the filter pipe or tank is vented.
In order to prevent dirt in the fuel from entering the fuel pump or carburetor, fuel filters and screens are ud in the fuel system. If the dirt is not removed from the fuel, the normal operation of the units will be prevented. The engine performance will also be reduced.刀削面怎么和面
The filter is either fitted inside the fuel tank and pump or operates as a parate unit connected between the fuel tank and pump or between pump and 声明是什么意思carburetor into the fuel lines. Carburetors are also provided filter screens while a filter element is provided in the fuel tank.女生背景图片
The fuel filter ud is generally a diment bowl made of glass or metal and a strainer screen. When the fuel drawn from the tank pass through the filter (through the bowl and strainer screen), particles of dirt and water ttle in the bottom of the bowl. In certain vehicles, a parate filter either of the disk or ceramic type is ud. It is either located between the fuel pump and carburetor or in the fuel line.
For connecting the fuel tank to the fuel pump, metallic tubes or synthetic rubber ho u
d are called fuel lines. They are usually positioned with metallic clips along the frame side members. The tubing or fuel lines are also ud to connect fuel pump to the carburetor. In order to absorb vibration as well as prevent breakage of the fuel lines, a short flexible line is ud between the fuel pump and the tank.
In order to meter and caution the driver of the motor vehicle about the quantity of fuel consumed and left in the tank, a fuel gauge is ud. It is generally fitted on dash board for easy reading of the fuel. It is usually a balancing coil type having construction similar to that of an oil gauge. It is generally electrically operated.
腹泻是什么症状It consists of a nding unit mounted on the fuel tank and a receiving unit having a caliberated gauge mounted on the instrument panel.
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A nding unit consists of a float controlled thermostat or variable resistor. With a float and the float arm extending into the fuel tank, the whole unit is mounted on it. The level of fuel in the tank varies the position of the float. The amount of electrical resistance within the variable resistor for controlling the amount of current nt to receiving unit on the instr
ument panel is determined by the float position.
