5.20.2. Check of pressure of fuel in a power supply system

The main indicator for definition of serviceability of a power supply system of the engine is fuel pressure in a fuel stage.
With an insufficient pressure of fuel the following malfunctions are possible:
– unstable operation of the engine;
– engine stop idling;
– the increased or lowered frequency of rotation of a bent shaft idling;
– insufficient acceleration performance of the car (the engine does not develop full capacity);
– breakthroughs and failures in operation of the engine at the movement of the car.
For a start we recommend to check reliability of electric contacts in blocks of plaits of wires of the knots of system of injection which are responsible for fuel supply (an electrogasoline pump, nozzles).
It is possible to check fuel pressure in a power supply system only the manometer with a hose for connection to a fuel stage.
1. Include ignition and listen — you have to hear a sound of work of an electrogasoline pump within several seconds. If the sound of work of an electrogasoline pump is not heard, check an electric power-supply circuit of the pump.
2. Reduce pressure in a power supply system (see. "Pressure decrease in a power supply system").
3. Connect the manometer with a measurement limit not less than 5 kgfs/cm2 in a rupture of the pipeline from the fuel pump to the fuel highway, connect the block of a plait of wires disconnected at pressure decrease to the fuel pump, and launch the engine. At the idling engine pressure in the pipeline has to be not less than 3 kgfs/cm2.
The following reasons of pressure decrease are possible:
– the fuel pressure regulator is faulty;
– fuel filters are littered;
– the electrogasoline pump is faulty.
Ways of elimination of these malfunctions see in the subsections "Check and Replacement of the Regulator of Pressure of Fuel"; "Replacement of the fuel filter"; "Replacement of the fuel pump".