Gasoline pump.
The function of the gasoline pump is to suck the gasoline out of the tank and press it through the pipe and the gasoline filter to the float chamber of the carburetor. It is because of the gasoline pump that the gasoline tank can be placed at the rear of the car, away from the engine, and below the engine.
Gasoline pump according to the different driving mode, can be divided into mechanical drive diaphragm type and electric drive type two.
Diaphragm type gasoline pump
Diaphragm type gasoline pump is a representative of mechanical gasoline pump, used in carburetor engine, generally driven by eccentric wheel on the camshaft, its working situation is:
① Oil suction camshaft rotation, when the eccentric top shake arm, pull down the pump film rod, pump film down, produce suction, gasoline will be sucked out from the tank, and through the oil pipe, gasoline filter, into the oil chamber of the gasoline pump.
② Pump oil When the eccentric turns a certain Angle and no longer tops the shake arm, the pump film spring is stretched, the pump film rises, and the gasoline is pressed from the oil outlet valve to the float chamber of the carburetor.
The diaphragm type gasoline pump is characterized by its simple structure, but due to the thermal effects of the engine, special attention should be paid to ensuring the pump oil performance at high temperatures, as well as the durability of the rubber material's diaphragm to heat and oil.
The maximum oil supply of the general gasoline pump is 2.5 to 3.5 times larger than the maximum fuel consumption of the gasoline engine. When the pump oil is greater than the fuel consumption and the needle valve of the carburetor float chamber is closed, the pressure in the oil pump outlet line increases, reacts to the oil pump, and the diaphragm travel is shortened or stops working.
Electric gasoline pump
Electric gasoline pump, not driven by camshaft, but by electromagnetic force repeatedly suction pump film. The electric pump can freely choose the installation position, and can prevent the phenomenon of air resistance.
The main installation types of electric gasoline pumps for gasoline injection engines are installed in the oil supply line or in the gasoline tank. The former has a large layout, does not require special design of gasoline tank, and is easy to install and disassemble. However, the oil pump suction section is long, easy to produce air resistance, and the working noise is larger, in addition, the oil pump must not leak, and this type has been less used on the current new vehicles. The latter fuel pipeline is simple, low noise, multi-fuel leakage requirements are not high, is the current main trend.
At work, in addition to providing the consumption required for engine operation, the flow of the gasoline pump should also ensure that there is sufficient return flow to ensure the pressure stability of the fuel system and sufficient cooling.
What symptom does the gasoline pump break
1. Engine starting difficulty: This is the most common manifestation of gasoline pump failure, because the gasoline pump can not work normally, resulting in insufficient fuel supply, and the vehicle is naturally difficult to start.
2. Flameout during driving: Due to the unstable fuel supply, the vehicle may suddenly flameout during driving.
3. Increased fuel consumption: If the gasoline pump fails, the car may consume more fuel to meet the normal operation needs.
4. Reduced engine performance: Due to the unstable fuel supply, the acceleration performance and top speed of the car can be affected.
5. The dashboard warning light is on: the fuel pump failure of some vehicles will be prompted by the dashboard warning light.
Working principle of gasoline pump
1, the principle of the gasoline pump is to suck the gasoline out of the tank, and through the pipeline and the gasoline filter pressure to the carburetor float room. It is because of the gasoline pump that the gasoline tank can be placed at the rear of the car, away from the engine, and below the engine. Electric gasoline pump, not driven by camshaft, but by electromagnetic force repeatedly suction pump film.
2, the principle of gasoline pump is to suck gasoline from the tank and pressure through the pipe and gasoline filter to the float room of the carburetor. The following is part of the introduction of the gasoline pump: It is because of the gasoline pump that the gasoline tank can be placed away from the engine of the car and lower than the engine.
3, the principle of the gasoline pump is to suck out the gasoline in the car tank and send it into the float chamber of the carburetor through the pipeline and the gasoline filter. Thanks to the gasoline pump, the car's fuel tank can be placed at the rear of the car, away from the engine and lower than the engine. The electric gasoline pump is not driven by the camshaft, but the electromagnetic force repeatedly sucks the pump film.
1. Excessive pressure of gasoline pump will destroy normal lubrication conditions. Such as oil viscosity is too large, metamorphic gelatinization, filter element and oil passage blockage, pressure regulator adjustment or can not be opened will cause high oil pressure.
2, centrifugal pump impeller wear: oil supply pressure is reduced, acceleration is weak. Carbon brush wear: Gasoline pump stops, can not start, in this case can hit the bottom of the tank, the pump can still run. Mechanical failure such as rotor stuck: the working current of the oil pump rises, causing damage to the relay or insurance.
3, the main reasons for the instability of automotive fuel pressure are: fuel pressure regulator damage to the fuel pump, insufficient pump oil or oil filter screen blockage of the fuel pump, circuit contact with poor fuel filter element or fuel pipe blockage. The fuel pressure is unstable, and the impact on the car is mainly the idle speed is unstable, and the engine operation department is weak to accelerate. I hope you found it useful.
4, oil pressure is too low: oil pump damage, pump oil shortage, oil pressure regulator.
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