To perform the work, you will need a pressure gauge to check the fuel pressure with a set of adapters for the fuel lines of foreign cars, preferably an inspection ditch or overpass.
Warning! Before performing the operation, be sure to read the section «Safety measures for the maintenance and repair of the engine management system».
Execution sequence
1. We prepare the car for work (see «Preparing the car for maintenance and repair»).
2. On 1.8 DOHC engines, remove the engine trim (see «Decorative overlay of the engine - removal and installation»).
3. Unscrew the protective cap of the diagnostic fitting on the fuel rail.
Engines 1.4 and 1.6 DOHC
Engine 1.8 DOHC
4. We connect a special pressure gauge to the fitting on the fuel rail in accordance with the operating instructions for the device.
Engines 1.4 and 1.6 DOHC
Engine 1.8 DOHC
5. We measure the fuel pressure in accordance with the operating instructions for the device. The pressure should be within 300-380 kPa. The following malfunctions are possible.
Pressure below normal (but not completely missing). The most likely causes are clogging of the fine or coarse fuel filter, fuel supply line, malfunction of the fuel pressure regulator or fuel pump. In this case, we first blow out the fuel line with compressed air, having previously disconnected it from the fuel rail, fuel module (see «Fuel pump - check and replace») and fuel filter (see «Fuel filter - replacement»). If the pressure does not return to normal, check the coarse fuel filter (see «Fuel pump - check and replace»), replacing the fuel filter (see «Fuel filter - replacement»). If the above operations did not help, then the fuel pump or pressure regulator is faulty. To clarify the faulty element, disconnect the return fuel line from the fuel module and insert into it, for example, a securely plugged fitting of the old fuel filter. Re-measure the pressure in the fuel rail.
Warning! If the pressure exceeds 380 kPa, you must immediately turn off the ignition, in order to avoid damage to the fuel lines! At the same time, this will indicate a malfunction of the fuel pressure regulator (see «Fuel pressure regulator - check and replace»).
If the pressure does not increase, then the fuel pump is faulty (see «Fuel pump - check and replace»).
Comment. There is another way to check the pressure regulator, however, it requires the removal of the regulator (see «Fuel pressure regulator - check and replace»).
The pressure is above normal. The most likely causes are a clogged fuel return line or a faulty fuel pressure regulator. In this case, we first blow out the return fuel line, having previously disconnected it from the fuel filter and the fuel tank (should be blown from the fuel tank to the filter). If it doesn't help, check the regulator (see «Fuel pressure regulator - check and replace»).
There is no pressure. If there is no pressure, then the fuel pump or its electrical circuit is faulty (see «Fuel pump - check and replace»).
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