1. Turn on the ignition and listen: within a few seconds you should hear the sound of the electric fuel pump. If it is not audible, check the electrical supply circuit of the electric fuel pump.
2. Remove the air filter (see «Removal and installation of the air filter»).
3. Disconnect the fuel supply pipeline from the fuel rail by squeezing the retainer of the locking element of its fastening.
Attention! The fuel in the power system is under high pressure, so it is forbidden to loosen the fuel line connections while the engine is running or immediately after it has stopped. To carry out work in the power supply system on a just stopped engine, it is necessary to first reduce the pressure in the power supply system (see «Reducing the pressure in the power system»). In 2–3 hours after the engine is stopped, the pressure in the power supply system will drop by itself to almost zero.
4. To check the fuel pressure, connect a pressure gauge (with a measurement limit of at least 5 kgf/cm2) between the fuel rail and the fuel supply line. With the engine idling, the pressure in the fuel line must be at least 300 kPa (3 kgf/cm2).
The following reasons for pressure drop are possible:
- faulty fuel pressure regulator;
- clogged fuel filter;
- faulty fuel pump.
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