What are the Phenomena of a Damaged Car Fuel Pump?

Equipment oil pump is also called fuel pump or gasoline pump, which is a very important part of the engine fuel system, the role is to give the fuel system a certain fuel pressure, if the fuel pump damage will cause the engine difficult to start, poor acceleration or weak running and other phenomena, the following we will specifically analyze the causes.

Explanation of the Working Principle and Structure of Gasoline Pump

Nowadays, EFI gasoline vehicles basically use electric fuel pumps, although the way of supplying fuel varies from engine to engine. The composition of the fuel system is shown in the figure below, where the electric fuel pump (gasoline pump) is installed inside the equipment tank, this way is called built-in, the pump is immersed in the tank to prevent the air resistance phenomenon and prevent air from running into the fuel line. The pumping of gasoline pump should be increased with the engine load and speed, and the maximum pumping volume is generally more than twice the maximum fuel supply required by the engine to meet the needs of the maximum engine load.

The electric fuel pump is a great improvement over the previous mechanical diaphragm type fuel pump, which can reduce the wear and tear inside the fuel pump and has more stable performance. The diaphragm type gasoline pump is driven by the eccentric wheel of the engine camshaft. The eccentric wheel relies on the rocker arm to drive the diaphragm tie rod down, compressing the diaphragm spring to make the volume on the diaphragm bigger, generating a certain vacuum into the fuel.

The end of the armature is connected to the impeller, and there are many teeth missing on the edge of the impeller, and there are oil inlet and outlet ports machined on both sides of the internal housing. Under the action of the impeller, the fuel enters from the inlet port to the inside of the oil pump and flows out from the refueling port after being pressurized. Because as long as the oil pump works, then the fuel will continuously cool the high-speed armature rotor, so no matter how low the fuel level is and how much oil is left in the tank, the oil pump can guarantee the cooling, except for those oil pumps installed outside the tank in the old age.

In the oil pump outlet installed with a safety valve (pressure limiting valve), the valve's main role is to prevent the oil pump pressure is too high, because some owners of the gasoline filter replacement time is not very well understood, often forget to replace, or due to add the oil quality is not good resulting in the oil pipe out of the oil pressure becomes small, but the internal pressure becomes high, the consequences of this is the oil pump damage or oil pipe rupture.

One-way valve (out of the valve) is conducive to the engine in the next start can be easier, because this valve is only fuel can flow out, oil is not flowing back, then in the engine work process can not be used up in the fuel residue in the oil pipe, in the next start the engine, it is equivalent to the fuel in advance of the arrangement in the oil pipe. Some models will be set to make the fuel pump run within 3 seconds of turning on the ignition switch, we can hear the sound of the fuel pump running at this time.

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Why is the Gasoline Pump Bad

Common causes of fuel pump failure are the quality of the fuel pump itself, fuel pump wiring problems, lack of filtering device, poor oil quality and too little oil in the tank for a long time. Lack of filtering device means that the filter of the fuel pump is clogged, owners of the equipment after using a period of time, if you feel that the equipment is not enough power, through the oil pressure gauge to detect the lack of oil pressure, then you can remove the fuel pump to clean the filter, do not replace the fuel pump.

Fault Phenomenon of Damaged Gasoline Pump

1, the fuel level display is not allowed

Now the gasoline pump is basically the fuel pump motor, gasoline filter and fuel level sensor integrated together, the working principle of the fuel level sensor is to change the height of the oil float in the fuel tank in the way of resistance piece resistance value change, and then converted into current to the instrument panel for display.

The main reason for the inaccuracy of the oil level is the abnormality of the internal resistance piece, such as oil film contamination contact resistance resulting in a larger resistance or directly off the break, or the fixed spring piece is loose, poor contact.

2, the engine can not start and bad acceleration

If it can't start because the fuel pump is damaged, most of them are caused by insufficient pressure, the main reason is that the upper and lower shells fall off, when the temperature of the heat is not the same, the welding points on the shell are not strong enough to cause cracking, so that the fuel leaks out and causes difficulties in fuel supply. If the gasoline filter is clogged and the motor speed speed drop will lead to a drop in fuel supply pressure, the use of more corrosive fuel (such as gasoline containing more methanol) will lead to clogging the filter with chemical goo attached to the filter.

3、Oil pump rattles and does not work

Oil pump noise and does not work is mainly the motor of the carbon brush commutator abnormal wear, which will lead to rotor jamming, a significant drop in speed and armature rotor running noise, etc., the most serious is to cause the engine to stall. If this is the cause, we can use the method of tapping the oil pump to temporarily make the pump run, and then slowly drive to the repair shop for repair. The solution to this problem is to avoid using poor quality fuel and replacing the carbon brush commutator with good quality and reliable workmanship.