Add: Mechanical&Electrical Industry Zone,Yuhuan,Zhejiang,China
Electric fuel pump for some reason, will lead to the emergence of the car difficult to start, Fuel Pump idle instability, acceleration, driving weakness, stop and stop the phenomenon, these reasons are:
1, the impact of hot air resistance;
2, dirty plug caused by reduced pump oil, Fuel Pump such as gasoline tank from time to time cleaning, resulting in oil pump into the port at the filter plug, cleaning the pump and filter, the pump can not return to normal;
3, pump capacity decline or failure for the oil filter dirty or reverse, Fuel Pump and sometimes due to refueling is not timely, resulting in increased heat load;
4, charcoal brush, spring, for the film, winding heat, Fuel Pump wear increased, the resistance value becomes larger;
5, the pump speed down, oil and oil decreased, so that the pump failure.
The check method is: first with a jumper to the fault detection socket on the two detection jack short, and then open the ignition switch (do not start the engine). Fuel Pump At this time from the tank should be able to hear the operation of the fuel pump sound. If you can not hear the sound of operation, you can pinch the gasoline hose should be able to feel the oil pressure. Otherwise, indicating that the electric fuel pump does not work, should check the electric fuel pump power fuse, the relay and control lines are faulty. Fuel Pump If you are normal, you should check the electric fuel pump.
(1) with a dedicated wire to the diagnostic seat on the fuel pump test terminal across the 12V power supply;
(2) Turn the ignition switch to the "ON" position, but do not start the engine;
(3) unscrew the fuel tank cover to hear the sound of the fuel pump work, Fuel Pump or hand into the oil hose should feel the pressure;
(4) If you can not hear the working sound of the fuel pump or the inlet tube without pressure, should repair or replace the fuel pump;
(5) If the fuel pump does not work failure, and the above check is normal,Fuel Pump should check the fuel pump circuit wires, relays, fusible fuse with or without open circuit.
Measure the resistance (coil) of the two terminals on the electric fuel pump with a multimeter resistance. Fuel Pump The resistance should be 2 ~ 3Ω (20 ~ 40 ℃). Otherwise, replace the electric fuel pump.
The measurement method is: the battery voltage should be more than 12Y, remove the battery negative cable, the release of fuel oil system, connected to the oil pressure gauge. After re-connecting the battery negative cable, use the jumper to short the two detection holes of the electric fuel pump, then turn on the ignition switch, Fuel Pump let the fuel pump work, and read the oil pressure gauge, the value should be consistent with the provisions. If the temperature is higher than the specified value, the pressure regulator should be replaced; Fuel Pump if below the specified value, check the oil hose and the connection with or without oil leakage, and check the fuel pump, gasoline filter and gasoline pressure regulator is normal Wait.
When disassembling the fuel pump Note: The fuel system pressure should be released and the electrical equipment should be switched off.
After removing the fuel pump, measure the resistance between the two terminals of the fuel pump should be 2 ~ 3Ω.
With the battery directly to the fuel pump power, Fuel Pump should be able to hear the pump motor high-speed rotation of the sound Note: power can not be too long.