4.12. Power supply system

Fig. 2.85. Details of a power supply system of GA14DE and GA16DE engines: 1 — a cover of the fuel tank; 2 — laying; 3 — a bulk pipe; 4 — the fuel tank; 5 — the fuel pump; 6 — the fuel level sensor; 7 — the fuel filter; 8 — the fuel pressure regulator; 9 — a stage; 10 — a fuel nozzle; 11 — the inlet pipeline; 12 — the sensor of temperature of cooling liquid; 13 — the HORN valve; 14 — the HORN pipeline; 15 — the sensor of differential pressure; 16 — the electromagnetic valve of the HORN system; 17 — an absorber; 18 — an air inlet hose; 19 — the muffler of noise of an admission; 20 — the case of the air filter; 21 — a separator of vapors of oil; 22 — the air filter; 23 — a cover of the air filter; 24 — the case of a butterfly valve; 25 — the regulator of the accelerated idling; 26 — the idling regulator; 27 — the measuring instrument of a mass consumption of air; 28 — the sensor of provision of a butterfly valve; 29 — the drive of a temperature regulator of the raised turns

The system includes the following basic elements: the fuel tank, the electric fuel pump shipped in a tank, the fuel pressure regulator, the idling regulator, sensors and four fuel nozzles (fig. 2.85). The steel stamped fuel tank with a capacity of 50 l fastens behind a body before a back axis.

The absorber — the filter with absorbent carbon providing absorption of vapors of fuel with the subsequent their use is provided in a power supply system.

Fig. 2.86. Placement of the fuel pump with the sensor of the index of level of fuel (the pillow of a back seat is removed): 1 — the fuel supply pipeline to nozzles; 2 — the drain pipeline; 3 — the contact socket of the fuel pump; 4 — the contact socket of the sensor of the index of level of fuel

The rotor electrogasoline pump connected to the fuel level sensor is placed in the fuel tank. Indications of the sensor can be checked according to tab. 2.8. The pump turns on the controller by means of the relay. Food on the relay moves with a delay about 5 pages. Access to the pump with the fuel level sensor is provided via the hatch in a body floor under a back seat (fig. 2.86). Check of a power supply system of the engine can be carried out, using these tab. 2.9.

The indication of the index of level of fuel in a combination of devices	Size A *	Resistance size between conclusions "1" and "3", Ohm
Arrow at the beginning of a scale	131	78-85
Arrow in the middle of a scale	86	27-35
Arrow at the end of a scale	36	4-6

What is checked	Check conditions	Result of check	Condition of system and way of elimination of malfunction
Chain of power supply of the fuel pump	The switch of ignition is switched on. Socket of the fuel pump расстыкован. Measure tension between a conclusion of "1" socket and "weight"	U = Uak.bat.	The chain of power supply is serviceable
		U = 0	Break in power supply chain. The safety lock No. 17 in the assembly block of interior of the car burned down. Break of a wire between a conclusion of "1" socket of the fuel pump and a conclusion "5" sockets of the relay of turning on of the fuel pump. Wire breakage, suitable to the relay of turning on of the fuel pump. Malfunction of the relay of turning on of the fuel pump
Fuel pressure in system	Be convinced of serviceability of fuel-supply lines. Connect the control manometer between the fuel highway and the fuel filter. "Short-circuit" conclusions "3" and "5" sockets of the relay of turning on of the fuel pump. Turn on the ignition switch	Р = 0	Carry out the inspection stated in the previous point
		Р <2,45 kgfs/cm2	Press the drain pipeline. If pressure increases, replace the fuel pressure regulator. If pressure does not change, check tightness of fuel nozzles and carry out test with the new fuel pump
		P> 2,45 kgfs/cm2	Replace the fuel pressure regulator
Tightness of fuel system	Carry out the inspections stated in the previous point then press the bringing and drain pipelines	Lack of considerable pressure drop in system within 10 min.	Normal tightness of system
		Big pressure drop	Check tightness of fuel nozzles and pipelines. Eliminate thinnesses of connections

Supply voltage of the fuel pump is 12 Century.

Fig. 2.87. Placement of an absorber (1) and fuel filter (2)

The fuel Nissan filter settles down in a back part of a motor compartment (fig. 2.87) on the left side. At installation the ring ledge has to be focused towards nozzles up.

The diaphragm regulator of pressure of fuel provides the constant pressure of fuel in a power supply system and supports idling the engine the following pressure:

— at the vacuum hose disconnected from pressure regulator: 2,45 kgfs/cm2 for GA engines and 3,0 kgfs/cm2 for the SR20DE engine;

— at the attached hose: 2,94 kgfs/cm2 for GA engines and 2,4 kgfs/cm2 for the SR20DE engine.

The regulator of pressure of fuel is installed to the left of a fuel stage.

Fuel electromagnetic nozzles provide injection of fuel in cylinders and fasten to the fuel highway. Supply voltage of nozzles is 12 Century.

With a constant pressure in fuel system time of opening of nozzles remains the only parameter influencing amount of injectable fuel.

The controller counts duration of opening of nozzles depending on the provision of a butterfly valve, loading and frequency of rotation of a bent shaft, i.e.

quality of gas mixture, necessary in each timepoint. It sends impulses of various duration to nozzles and supports an optimum dosage of fuel. Fuel injection duration increases a little during warming up of the engine. At warming up, and also in case of operation of the controller on the reserve program of a nozzle open at the same time. At a normal operating mode of a nozzle open serially according to an operating procedure of cylinders.

The replaceable dry air filter is located in the case over the inlet pipeline.

The case of a butterfly valve is installed on the inlet pipeline. In the case the butterfly valve, the sensor of provision of a butterfly valve, the measuring instrument of a mass consumption of air, the idling regulator, the regulator of the accelerated idling (on cars with the conditioner), the drive of the automatic starting arrangement and the screw of adjustment of turns of idling settle down. The case is warmed with liquid from the engine cooling system.

The regulator of idling is executed in the form of the electromagnetic valve which changes the cross section of the air duct located bypassing a butterfly valve.

The regulator of the accelerated idling is installed on the cars supplied with the conditioner and provides increase in frequency of rotation of the engine idling at turning on of the conditioner. The regulator represents the electromagnetic valve of on-off type which changes the cross section of the air duct located bypassing a butterfly valve.

The temperature regulator of the raised idling turns on the cold engine includes the thermosensitive element located on the pipeline of cooling liquid in the case of a butterfly valve. At start of the cold engine the thermosensitive element influences through a cam a control lever a butterfly valve, raising engine turns and by that accelerates its warming up.

The valve of the recirculation of the fulfilled gases (RFG) is fixed behind a head of the block of cylinders on the inlet pipeline on the left side. The valve operates giving in the inlet pipeline of a part of the fulfilled gases due to the depression given from an inlet collector and by means of the HORN electromagnetic valve. The depression attached to a valve membrane is regulated by the valve of differential pressure.

Recirculation of the fulfilled gases leads to burning fall of temperature that, in turn, reduces quantity of the oxides of nitrogen (NOX) which are pollutants of the environment and making especially harmful effects on a human body. The nitrogen which is contained in air is oxidized oxygen at high temperature. Mixing of the fulfilled gases with the arriving fresh air causes decrease in content of oxygen in the soaked-up air and, as a result, burning fall of temperature that reduces also the number of NOX in the fulfilled gases. The valve of differential pressure is located behind a head of the block of cylinders on the inlet pipeline on the left side. The valve regulates the depression attached to the HORN system valve membrane depending on pressure of the fulfilled gases, determining by that amount of the fulfilled gases coming to the HORN system.