- check the condition and degree of charge of the battery and, if necessary, charge it;
- check the fuse in the fuel pump power circuit;
- check the condition of the fuel pipes and hoses for leaks;
Listen to the fuel pump for proper operation. Have an assistant turn the ignition key to position «ignition on», while you should hear a click and noise generated by the pump within 2 seconds (noise from the fuel pump is most conveniently heard through the filler neck of the fuel tank). If the fuel pump is not working, check the fuel pump power circuit. If the fuel pump works but does not generate the required pressure, the pressure generated by the pump must be checked.
Checking the pressure generated by the fuel pump. To check the pressure in the fuel system, it is necessary to have a pressure gauge and an appropriate adapter for connecting to the fuel system, taking into account the following notes:
- on models up to 2001, the fuel hoses are connected with hollow bolts with washers to the fuel filter, the fuel filter is mounted on a bracket on the left side in the engine compartment;
- on models since 2001, the fuel hoses are connected by quick connectors, the fuel filter is mounted on the fuel pump unit.
Relieve pressure in the fuel system.
Connect a pressure gauge as follows:
Pic. 5.1. Location of the hollow bolt for fastening the fuel outlet hose from the fuel filter on models up to 2001 of release
- on models prior to 2001, remove the relay and fuse box from the bracket and disconnect the fuel outlet hose from the fuel filter and connect the pressure gauge adapter to the fuel filter outlet (pic. 5.1);
Pic. 5.2. Fuel pipe connector location on models since 2001
- on models since 2001, disconnect the fuel line connector near the fuel distribution line and connect the pressure gauge adapter to it (pic. 5.2).
Turn on the ignition, while the fuel pump should run for 2 s.
Take readings on the manometer. If the fuel pressure is higher than the specified value, replace the pressure regulator. If the fuel pressure is below specification, the fuel filter and/or fuel lines may be clogged, fuel leaks, or the fuel pump and/or pressure regulator may be faulty.
Start the engine and warm it up to operating temperature. Check fuel pressure. If fuel pressure is below specification and no obvious cause is found, the pressure regulator and/or fuel pump may be defective. In this case, it is recommended to replace the pressure regulator and the fuel pump.
Stop the engine and constantly monitor the pressure in the fuel system, which must be kept constant. 5 minutes after turning off the engine, the pressure in the fuel system should be 150 kPa. If the pressure has dropped to a much lower value, the pressure regulator and/or the fuel pump are defective or the fuel distribution line is leaking.
After checking the fuel pressure, relieve the pressure in the fuel system and disconnect the pressure gauge with adapter.