With insufficient fuel pressure, the following malfunctions are possible:
- unstable engine operation;
- stop the engine at idle;
- increased or decreased idle speed of the crankshaft;
- poor vehicle handling (engine does not develop full power);
- jerks and dips in the engine when the car is moving.
To begin with, we recommend checking the reliability of the electrical contacts in the connectors of the wiring harnesses of the injection system units responsible for supplying fuel (electric fuel pump, injectors).
You can check the fuel pressure in the power system only with a pressure gauge with a hose for connecting to the fuel rail.
1. Turn on the ignition on the car and listen - you should hear the sound of the electric fuel pump for a few seconds. If the sound of the operation of the electric fuel pump is not audible, check the electric power supply circuit of the pump.
2. Turn away a protective cap of the union for control of pressure of fuel on an end face of a fuel stage. Please note that the cap has an o-ring. If the ring is torn or has lost elasticity, replace the ring or cap.
3. Reduce the pressure in the engine power system (see «Reduced fuel pressure in the engine power system»).
4. Using the metal protective cap of the tire valve, unscrew the spool (same as tire)...
5.... and remove it from the fitting.
6. Connect a hose with a pressure gauge to the fitting (You can use a tire gauge). Secure the hose to the fitting with a clamp. Start the car engine and check the pressure on the pressure gauge. It should be 380-400 kPa (3.8-4.0 kgf/cm2).
7. Stop the engine and reduce the pressure in the engine supply system (see «Reduced fuel pressure in the engine power system»).
8. Disconnect the pressure gauge from the pressure control fitting, screw the spool into the fitting and install the protective cap on the fitting.