Checking the pressure in the fuel lines (vehicles with petrol engines)
1. Relieve residual pressure in the fuel line.
Attention. After removing the fuel pump relay, a fault code may be displayed (DTC). Remove this code with a scanner (GDS) after completion of work to relieve residual pressure in the fuel line.
2. Install special tool (SST).
Attention. Even after performing the operations described in «Release of residual pressure in the fuel line», some residual pressure may exist in the system. Therefore, to prevent splashing of residual fuel, before disconnecting any fuel lines, cover the hose connection with a technical cloth.
Disconnect the fuel supply line from the fuel rail.
Install a fuel pressure gauge between the fuel supply line and the fuel rail (see picture below).
3. Inspect the junction of the fuel supply line, fuel rail and special devices for leaks with the ignition on.
4. Measure fuel pressure.
Start the engine and measure the fuel pressure with the engine idling. Fuel pressure: 324-363 kPa.
Note: If the fuel pressure is out of standard, repair or replace the related part (see table below).
Shut off the engine and watch the fuel gauge change. The pressure should not drop for approximately 5 minutes after the engine has stopped.
Note: If the fuel pressure drops, repair or replace the related part (see table below).
Switch off the ignition.
5. Relieve residual pressure in the fuel line (see section «Release of residual pressure in the fuel line»).
Attention. After removing the fuel pump relay, a fault code may be displayed (DTC). Remove this code with a scanner (GDS) after completion of work to relieve residual pressure in the fuel line.
6. Completion of the test:
Remove the special tool from the fuel feed line and fuel rail.
Connect the fuel supply line and fuel rail.
Release of residual pressure in the fuel line
Attention. Even after performing the operations described in «Release of residual pressure in the fuel line», some residual pressure may exist in the system. Therefore, to prevent splashing of residual fuel, before disconnecting any fuel lines, cover the hose connection with a technical cloth.
1. Turn the ignition key to position «OFF» and disconnect the negative (-) battery wire.
2. Remove the relay (A) fuel pump.
Attention. After removing the fuel pump relay, a fault code may be displayed (DTC). Remove this code with a scanner (GDS) after completion of work to relieve residual pressure in the fuel line.
3. Connect the negative wire (-) battery.
4. Start the engine and let it idle, then turn the ignition key to the «OFF» and wait for the engine to stop completely.
5. Disconnect the wire from the negative (-) battery terminals and install a relay (A) fuel pump.
6. Connect the negative wire (-) battery.
7. Erase with a scanner (GDS) fault code (DTC), relating to the fuel pump relay.