Checking the engine fuel system (Priora 2170)

The main indicator of the engine fuel system's health is the fuel pressure in the fuel rail. But first, we recommend checking the condition of the air filter (see "Removing and installing the air filter"), since this work is simple and will not take much time. After you have made sure that the air filter is clean, check the reliability of the electrical contacts in the pads with wires of the injection system units responsible for fuel supply (electric fuel pump, injectors).



To check the pressure in the fuel rail, use a pressure gauge with a rubber hose that matches the diameter of the test nipple on the fuel rail.

1. Turn on the ignition and listen: within a few seconds you should hear the sound of the electric fuel pump. If you cannot hear it, check the electrical circuit of the electric fuel pump.

2. Check the pressure in the fuel supply system by connecting a pressure gauge to the fitting on the fuel rail in the engine compartment (see "Checking the fuel pressure in the engine fuel system").

The following are possible reasons for the decrease in pressure:



– the fuel pressure regulator is faulty. The regulator is located in the fuel pump module;





– the fuel filter is clogged;



– the fuel pump is faulty.

You will find methods for troubleshooting these problems in the section. "Engine" (cm. "Engine power supply system").