Symptoms of blocked gasoline filter

The function of gasoline filter is to filter gasoline. All gasoline entering the engine must pass through the gasoline filter. If it is blocked, it will lead to insufficient fuel supply and the car will have no power to run. If there is no fuel supply because of serious congestion, the car will not catch fire.

Symptoms of gasoline filter blockage: gasoline pump filter screen blockage, gasoline filter blockage, and injector blockage to varying degrees will also cause insufficient oil supply. In addition, the filter screen on the fuel pressure regulator is blocked, resulting in poor oil return, which will lead to excessive pressure in the fuel system and excessive mixed gas.

Too thin and too thick mixture will lead to insufficient engine power and cause car bumps. The mixture is too thin: If the car slipping phenomenon is not felt or very light on the flat road surface during driving, but it is obvious or heavy on the uphill road surface, it can be judged that the mixture is too thin. Too much mixed gas: If the acceleration is slow when driving, the car will shrug when it is serious, and the driving feeling will be strong after refueling. This phenomenon is generally caused by excessive mixing. Treatment: First, make a preliminary analysis to determine whether the vehicle trip phenomenon is caused by fuel system problems. If it is determined that there is a problem with the fuel supply system, the pressure of the fuel supply system and the pressure of the gasoline pump should be measured. Connect the fuel pressure gauge on the oil path between the fuel pressure regulator and the injector with a tee, install the air filter, start the engine, and test the pressure of the fuel supply system when the engine is idling, medium load and heavy load. Then change the throttle opening, and the reading displayed by the fuel pressure gauge will change with the throttle opening, that is, the pressure value will increase with the throttle opening; Drive with the throttle.

Judging the blockage of gasoline filter: Most filters are paper filter elements, sealed with hard plastic shell, and the oil level inside can be observed from the outside, so it can be judged whether the filter is blocked by observing the rise of oil level. If the filter is a metal shell, remove the oil pipe and check whether the filter is blocked according to the oil supply of the pump oil. You can also remove the filter and blow it from the port of the oil inlet pipe connector on one side of the oil tank for inspection: if it is not completely ventilated or blown hard before ventilation, it means that the filter is blocked. Practice has proved that when the car travels at 8000- 12000 km, the speed decreases, and the maximum speed can only reach 60-70 km/h, and the engine runs unsteadily. Therefore, if you find that the car can't run, you should check the gasoline filter in time and replace it with a new one according to the original factory regulations.

Maintenance case of gasoline filter blockage A Jetta car, which can't accelerate after driving, is occasionally accompanied by shooting.

Detect the fault code stored in the engine control unit. The fault content is that the air-fuel mixture in cylinder bank 1 is too lean.

The measured idle acceleration performance is normal, the idle speed is not turned on, the load 17.6%, the fuel injection time is 3.0ms, the intake pressure is 36mbar, and the throttle opening is 3. 1%.

The air load is 26.2%, the injection time is 4. 1ms, the intake pressure is 438~459mbar, and the throttle opening is 5.4%. Combined with the lean mixture fault code, the measured idle fuel pressure is 220 kPa, which is slightly lower than the normal value.

According to the test data, it is suspected that the gasoline pump, gasoline filter or pressure regulator are faulty.

Because the gasoline filter has not been replaced for a long time, replace the gasoline filter first.

After replacing the gasoline filter, the vehicle runs normally under the empty switch, and the fault is eliminated.

The air-fuel engine has a heavy load, especially in hot summer, the fuel vapor increases relatively, and the fuel pressure in the fuel system decreases relatively.

After the gasoline filter is blocked, the oil supply is insufficient, which makes the car unable to accelerate. @20 19