In addition to the carburetor malfunction caused great delay in acceleration may be insufficient fuel supply is gasoline pump. This can occur at high speeds when the engine requires a lot of gasoline. To check the amount of fuel you need to follow a logical framework. On the way of gasoline from the tank to the carburetor can be many barriers to a greater or lesser extent, may impede the passage of fuel. If the random search problem, we can easily get lost in the diagnosis, make some unnecessary purchases and spend much time in vain. First, it checks the state of the fuel filter. An indicator of the purity of the fuel filter housing is transparent yellow filter element. The less visible yellow color, the more dirt in the filter. The more dirt, the worse the capacity of the filter element. Increasing the size of the filter means increases filter life. And vice versa. To ensure a clean filter to remove it, pour the gasoline out of it and try to blow it. Needless to say, that it is easy to clean filter is blown, and scored - in general is not blown. In addition to the fine filter replacement should still check the filter at the inlet to the carburetor. To visually assess the quality of the fuel should be removed from the carburetor fuel hose, send it in a clean plastic bottle and start the engine. For 10 - 12 seconds a mechanical pump should pump about 0.5 liters. gasoline. Poor fuel supply is always clearly expressed and fed her with a good will not mix. Gasoline should leave a strong pulsating jet with a cross section equal to the cross section of fuel hose. Check the manual fuel supply pumping fuel pump does not make sense, as important to us from the pump motor. When applying for a bad routine motor gasoline flowing trickle or intermittent. To find out what needed to be sure to disconnect the pump from the motor without removing the fuel hose and pressing the hand lever rod, or fuel pump to check its performance. Such verification is necessary in order to avoid failure within the pump from the engine. If the pump is disconnected from the motor gasoline supply has dramatically improved, so the cause of poor feed the motor was a big thick gasket between the pump and motor. Change the gasket thickness of 0.5 mm. can significantly affect the performance of the pump, as the better and for worse. This problem is typical for pumps with a straight shaft drive and is often found in cars, "Lada", "Moskvich", "Ford", "Opel", etc. Sometimes the cause of poor performance of the pump can be reduced and the thickness of the pads. But such a failure occurs much less frequently. In addition to the thickness of shims to affect pump performance: the length of the drive shaft, which may decrease due to production at the edges, bending of the mounting flange of the pump removes the lever actuator lever in the pump wear due to poor quality of the metal is more common in the new pumps. If the pump is disconnected from the motor fuel supply has not improved, it is necessary to remove the pump from fuel hoses and check for work already on the table, pumping gasoline from a bottle into the bottle. For this test, better to use a clear plastic tube, which make it possible to control the appearance of gasoline from air bubbles. The smaller the bubbles - the better performance of the pump. If the pump is on the table shows a good performance, you must again connect it to a branch pipe from the tank on the car and manually check the quality of the fuel supply. The pump motor does not bind. When these checks can not be in a hurry. It is better to repeat the test several times to be sure of the result. If the working pump can not effectively pump gasoline in the manual mode of the tank, then the fault is in the tank or fuel hoses. What reasons can prevent the passage of gasoline to the pump? Contamination of the fuel hoses. The inflection break at the fuel hose. Poorly tightened clamps. Flattened from the impact of metal fuel lines. Contamination of the fuel filter inlet in the tank. Winter - freezing of water in the tank and pipes. A faulty solenoid valve closes the outlet to gasoline in cars with the gas plant. Fuel hoses are rubber nebenzostoykoy swell and block your inner hole. Disposable plastic tubes for fuel filters can be peredavleny when tightening clamps. Clogged fuel tank ventilation results in a vacuum in the tank and making it difficult to yield fuels. This scheme checks the fuel is the fastest. Failure to observe the sequence, then the diagnosis may take a long time, and a new fuel pump will be bought for nothing. Repair should only be dismantled pumps. It is not necessary to undertake repair the pump housing is fully seamed. It's difficult and very dangerous. Having established in a foreign car rolling refurbished pump housing, you take on full responsibility for any possible fire. And this, at least, stupid. Repair collapsible pump no brainer. The most common faults are here: Breaking the diaphragm, clogging the body. Faulty valves or springs, the loss of the input and output chokes. Last fault is especially dangerous, as while driving may cause a fire. Therefore, during the checks to pay attention to the strength of press-fit fittings. The consequence of inadequate performance fuel pump may not only be a failure of power when accelerating. This feature is shown together with the deterioration of the dynamics of dispersal vehicle at high speeds. From the car accelerates well and even a few minutes is going well. But it quickly ends, the rate decreases with jerks and if you continue to put pressure on the gas, the engine quickly stall. To continue in such a situation, it is necessary to enable the engine to idle for 30 seconds. During this time in the float chamber has time to gather enough gasoline and an opportunity to briefly go well. The best option of driving in this situation is short, smooth acceleration and further prolonged coasting.
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