Order of execution
1. Turn off the ignition.
2. With additional wires, apply voltage to the fuel pump connector and check if the pump works or does not work.
Attention! To hear the running fuel pump located in the fuel tank, remove the plug from the fuel filler neck.
3. Pinch the fuel supply hose to determine if the fuel pump is building pressure.
Checking the pressure generated by the fuel pump
1.. Remove the rear seat cushion and remove the fuel pump inspection panel.
2. To relieve pressure in the fuel system, disconnect the fuel pump connector, start the engine and wait until it stops due to the exhaustion of fuel from the fuel lines and fuel line.
Attention! Depressurize the fuel system before disconnecting the fuel lines, as otherwise pressurized fuel will leak rapidly from the fuel system.
3. Disconnect a wire from the negative plug of the storage battery and connect a socket of the fuel pump.
4. Connect the pressure gauge adapter to the fuel filter (09353–24000, 09353–24100, 09353–38000) and tighten the mounting bolt to the required torque. Tightening torque: 25–35 Nm.
5. Connect a wire to the negative plug of the storage battery.
6. Apply voltage to the fuel pump connector with additional wires and check that there are no fuel leaks from the pressure gauge connections.
7. Start the engine and let it run at idle speed.
8. Measure fuel pressure. Fuel pressure: 350 kPa.
9. If the measurements made in steps 7 and 8 do not correspond to the required fuel pressure, determine the cause and make the necessary repairs.
Condition | Probable Cause | Elimination Method |
Fuel pressure too low | a. Fuel filter dirty. | a. Replace fuel filter. |
b. Fuel return side leaks caused by a bad pressure regulator seal. | b. Repair leak or replace fuel pump | |
Fuel pressure too high | a. Sticking fuel pressure regulator. | a. Replace pressure regulator. |
10. Stop the engine and after 5 minutes read the fuel pressure value on the pressure gauge, which should not change. If the fuel pressure has dropped significantly, determine the cause and make the necessary repairs.
Condition | Probable Cause | Elimination Method |
Fuel pressure decreases slowly after engine shutdown | Leaky fuel injector | Replace fuel injector |
Fuel pressure decreases very quickly after engine shutdown | Fuel pump check valve open | Replace fuel pump |
Relieve the pressure in the fuel system.
Disconnect the hose and pressure gauge.
Cover the connection with a towel to prevent splashing of fuel caused by residual pressure in the fuel line.
11. Relieve pressure in the fuel system.
12. Disconnect the hose and pressure gauge.
Warning! Cover the connection with a towel to prevent splashing of fuel caused by residual pressure in the fuel line.
13. Replace the O-ring at the end of the hose.
14. Connect a hose to a fuel highway and tighten a connecting nut the demanded moment.
15. Check up tightness of fuel system.