5.14.2. Check of pressure of fuel in a power supply system
The main criterion 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.
If you included ignition three times without attempt of launch of the engine and once again the electrogasoline pump will not begin to work, it is not a malfunction sign. It will join along with the beginning of launch of the engine a starter.
2. Reduce pressure in a power supply system (see. "Pressure decrease in a power supply system").
3. Disconnect a fuel hose from the union of a fuel stage (see. "Removal and installation of a fuel stage").
At removal of a hose a small amount of fuel can flow out. Wipe it rags.
4. For check of pressure of fuel connect in a gap between a fuel hose and the union of a fuel stage the manometer with a limit of measurements not less than 5 kgfs/cm2.
5. Connect the block of a plait of wires disconnected at fuel pressure decrease to the fuel module, and launch the engine. At the idling engine pressure in the pipeline has to be about 350 kPa (3,5 kgfs/cm2).
The following reasons of pressure decrease of fuel are possible:
– the fuel pressure regulator is faulty;
– the fuel filter of thin purification of fuel is littered...
... or fuel receiver filter;
– the fuel pump is faulty.
6. Stop the engine and reduce pressure in a power supply system (see. "Pressure decrease in a power supply system").
7. Disconnect the manometer from a fuel hose and the union of a fuel stage.
8. Connect a fuel hose to the union of a fuel stage.