What Is a Gasoline Pump?

The role of the gasoline pump is to suck gasoline out of the fuel tank and pressurize it to the float chamber of the carburetor through the pipeline and the gasoline filter. It is because of the gasoline pump that the gasoline tank can be placed in the rear of the car far from the engine and lower than the engine.

The role of the gasoline pump is to suck gasoline out of the fuel tank and pressurize it to the float chamber of the carburetor through the pipeline and the gasoline filter. It is because of the gasoline pump that the gasoline tank can be placed in the rear of the car far from the engine and lower than the engine.

Gasoline pumps can be divided into two types: mechanically driven diaphragm type and electric driven type according to different driving methods.

Chinese name

Petrol pump

Gasoline Pump Introduction

The role of the gasoline pump is to suck gasoline out of the fuel tank and pressurize it to the float chamber of the carburetor through the pipeline and the gasoline filter. It is because of the gasoline pump that the gasoline tank can be placed in the rear of the car far from the engine and lower than the engine.

Gasoline pump classification

Gasoline pumps can be divided into two types: mechanically driven diaphragm type and electric driven type according to different driving methods.

Diaphragm gasoline pump

Diaphragm gasoline pump is the representative of mechanical gasoline pump. It is used in carburetor engine. It is generally driven by eccentric wheel on camshaft. Its working condition is:

During the rotation of the suction camshaft, when the eccentric wheel lifts the rocker arm and pulls down the pump membrane lever, the pump membrane is lowered and suction is generated, and the gasoline is sucked out of the fuel tank, and passes through the oil pipe, the gasoline filter, and the oil entering the gasoline pump room.

Pump oil When the eccentric wheel rotates through a certain angle and no longer pushes the rocker arm, the pump diaphragm spring is stretched, and the pump diaphragm is pushed up to push the gasoline from the oil outlet valve to the float chamber of the carburetor.

Diaphragm gasoline pump is characterized by simple structure, but due to the heat of the engine, special attention should be paid to ensuring the pump oil performance at high temperature, and the durability of the diaphragm of rubber material to heat and oil.

The maximum fuel supply of a general gasoline pump is 2.5 to 3.5 times greater than the maximum fuel consumption of a gasoline engine. When the pump oil quantity is greater than the fuel consumption and the carburetor float chamber needle valve is closed, the pressure in the oil pump's oil outlet pipeline increases, which is reflected to the oil pump, which shortens the diaphragm stroke or stops working.

Gasoline pump electric gasoline pump

The electric gasoline pump does not rely on the camshaft to drive, but repeatedly sucks the pump membrane by electromagnetic force. This electric pump can freely choose the installation position and can prevent air blocking.

There are two main types of installation of electric gasoline pumps for gasoline injection engines, which are installed in the fuel supply line or in the gasoline tank. The former has a larger arrangement range, and does not require a specially designed gasoline tank, and is easy to install and disassemble. However, the oil suction section of the oil pump is long, it is easy to produce air resistance, and the working noise is also large. In addition, the oil pump must not be leaked. This type is rarely used in current new vehicles. The latter has a simple fuel line, low noise, and low requirements for multiple fuel leaks, which are the current major trends.

In operation, in addition to providing the consumption required for engine operation, the flow rate of the gasoline pump should also ensure sufficient oil return flow to ensure the pressure stability and sufficient cooling of the fuel system. ^[1]