Leak test
Attention! The power system is under pressure! Wear safety goggles and protective clothing to avoid injury and skin contact. Before disconnecting the elements of the system, the connection point must be wrapped with rags. Then release the pressure by carefully disconnecting the hose.
Check condition:
- Fuel pressure should be correct, check:
- Remove connectors (arrows) from all injectors.
- Release the injector wiring harness.
- Unscrew the fuel rail from the intake manifold.
- Remove the fuel rail with injectors from the intake manifold (fuel line remains connected).
- Remove fuse SC 43 from fuse holder C.
- Remove electric fuel pump relay 2 (J49) from the relay box under the front panel on the left.
- Connect remote control (push button switch) to pin 7/87 (5) electric fuel pump relay 2 (J49) and to the positive terminal of the battery.
This operation is necessary only to ensure the operation of the fuel pump when the engine is not running.
Injector leak test (visual inspection).
When the pump is running, only 1-2 drops of fuel per minute can flow out of the injectors.
If more fuel flows out, then the leaky injector must be replaced.
When installing injectors, only new O-rings should be used.
Checking the amount of injected fuel
Verification conditions:
- Fuel pressure should be ok, check:
- The injectors are installed in the fuel rail and the fuel line is connected.
- Position the nozzle so that the atomized fuel is completely captured by the measuring container.
- Remove electric fuel pump relay 2 (J49) from the relay box under the front panel on the left.
- Connect remote control (push button switch) to pin 7/87 (5) electric fuel pump relay 2 (J49) and to the positive terminal of the battery.
- Connect one of the injector contacts to «weight» engine.
- Connect the second contact of the connector of the tested injector through a push-button switch to the positive terminal of the battery.
- Press the remote control switch button and hold it pressed for 30 seconds.
- Repeat test on other injectors. For other injectors, other measuring containers should be taken.
- Compare the volume of injected fuel. Target value: 85-105 ml for each nozzle.
When checking the quantity of injected fuel, the shape of the sprayed fuel is also checked. The shape of the torch must be the same for all nozzles.
The jet of atomized fuel must be the same for all nozzles.
If the measured value of the amount of fuel for one or more injectors is out of the range of nominal values in one direction or another, replace the faulty injector.
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