Guide, repair and replacement fuel pump

One of the main devices the car with fuel injection, which depends much on the move - the electric petrol pump. Let's talk about this device, its problems and how to resolve them. So to the rescue all motorists offers guidance, repair and replacement fuel pump. First of all, if there are suspicions it is not functioning correctly, you need to explore the two main parameters - flow and pressure. The third option is checked on the stand to have removed the engine - the current consumption at full load and nominal. It is advisable to start testing with the power supply connector on the submersible gasoline pump. Or at the terminals of the suspended fuel pump. Testing the connector, you need to find dating to the side of the wire (without disconnecting connectors), measure the voltage tester. The normal rate - more than 12 volts, especially if this is a noise working fuel pump. Further, many typical error admit - measuring the voltage across the disconnected connector. This is wrong because it is impossible to identify the defect of poor contact. To pull connectors readings will always be 12 volts, and under load can be much smaller. The next stage of checking fuel pressure, before that, dropping the pressure in it. You can remove the fuel pump connector or fuse, start the engine and wait for it full stop. Connect the gauge to fitting to measure the pressure, if it exists, and if not, then include a pressure gauge tee in the supply of fuel wire. Turn on the ignition and wait for 1.5 ... 2 sec. Then, when turned off, watching. During this time the petrol pump worker gives the pressure in the central injection 0,8-1,2 kg / cm, the distribution system - 2,5 ... 3,5 kg / cm. In the absence of the paging mode of fuel, gasoline pump include mandatory. If the pressure was too low, we must look for the cause - a dirty fuel filter, petrol pump or pressure regulator? After turning off the ignition pinch "return flow", and turned back on the ignition. If the pressure is increased - in case the pressure regulator. Disconnect return line, and send the feed end into a suitable container. Then turn on the ignition, and then check the pressure. If you do not change - the case in the pressure regulator, if the norm - packed with "tank line. Restore it, turn on the engine and measure pressure. The pressure should not change in the central fuel injection, and injection system - reduced by 0.5 kg / cm. Dramatically click on the throttle pedal, the pressure must jump up to 0,5 ... 0.6 kg / cm. Rapid movement pinch "return flow" pressure at the same time have to jump 2 times as compared to workers - this is the maximum working pressure fuel pump. Then look to see if fuel is not flowing out. Eliminates unreliable connections. Sometimes, the pressure rises too slowly. May be the same reasons, and may be clogged filter or low fuel level in the tank. It happens that the operating pressure is close to the norm, and usually do not increases - means fuel for the "return pipe" is not moving, because the fuel pump pressure is below the threshold for opening the fuel pressure regulator. Perhaps it into gasoline pump or low voltage, or leakage of fuel in the supply hose inside the tank. Observe the behavior of the gauge needle while working on the engine idling. Strong said sway of dirty fuel pump inlet grid. Rarely - a defect the fuel pressure regulator. If the submersible gasoline pump, remove immediately and will inspect the grid. Even if no external dirt, it must be washed and blow compressed air. When fuel pump design in the flask is purged and the second grid inside the bulb. Before you put the petrol pump ago, should examine the inner volume protivootlivnoy design. Water and mud is pumped out. If the pump is suspended, the input filter set is not available. In this case, the pinch clamp the hose between the gasoline pump and gas tank and disconnect the hose from the fuel pump. Check the pressure. If it is big, the filter is in order. If a thin stream - a grid is dirty. Blowing air helps briefly. If you do not change the fuel tank, it is necessary to pierce the net in several places, and install an external fuel filter. Start the engine and turned off the ignition. Pressure drop should not. If it falls, is to blame, or non-return valve, or not sealed burners, a pressure regulator. Re-engage the engine and immediately pinch supply line, after turning the ignition off. If the pressure does not fall - in case the check valve if the falls - the pressure regulator or injectors. Repeat the previous step and click on the "return flow". When the pressure drops it into the nozzles when not decreases - in case the regulator. To measure the performance of fuel pump in a convenient location sever "return flow" and sends an end to the vessel. Turn the pump on for 1 minute, and we believe merged into the vessel fuel, a measure of performance of the pump in a minute. Should be the norm within 1,0 ... 2,2 l / min. If on the passport data is in contrast, the case in the fuel filter or a petrol pump. Shoot what is easier for bench testing. If it's gasoline pumps, and it should be changed, consider that the best bet - a used, restored or new? New - the most expensive solution. But the life of the pump is not affected. Second hand - cheap, but with no guarantee of any particular service life. Restored pump - at an average price and warranty make from 6 to 24 months. Restoration of the gasoline pump is taking place today in various specialized workshops. Sometimes, three defective collect one working pump with new parts in old buildings, or replacing parts on the same type of exchange fund. Therefore, the replacement of a failed fuel pump on the restored version is completely justifies itself, if you know the specific places where it is done qualitatively. Strictly prohibited to put petrol pump on the system of central injection in split-injection system. Reverse exchanges also do not want to. When installing the fuel pump is recommended to fill a submersible gasoline pump fuel because with a small amount of fuel dry gidronagrevatel can not upload it.