Nissan Maxima QX

since 1993 of release

Repair and car operation



Nissan Maxima QX
+ Nissan Maxima brand Cars
+ Maintenance instruction
+ Settings and routine maintenance
+ Engine
+ Systems of cooling, heating
- Power supply system and release
   General information
   Sbrasyvaniye of pressure in a power supply system
   Check of serviceability of functioning of the fuel pump, measurement of pressure of fuel
   Check of a condition and replacement of fuel lines and their shtutserny connections
   Removal and installation of the fuel pump
   Check of a condition and replacement of the sensor of fuel consumption
   Removal and installation of a fuel tank
   Cleaning and repair of a fuel tank - general information
   Removal and installation of assembly of an air purifier
   Removal, installation and adjustment of a cable of an accelerator
   System of electronic injection of fuel (EFI) - the general information
   Check of serviceability of functioning of system of injection
   Check of a condition and replacement of the case of a throttle
   Removal and installation of a regulator of pressure of fuel
   Removal and installation of the fuel highway and injection injectors
   Check and adjustment of turns of idling
   Release system - the general information
+ engine Electric equipment
+ Control systems of the engine
+ Transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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Check of serviceability of functioning of the fuel pump, measurement of pressure of fuel

See preventions at the beginning of pressure Sbrasyvaniye's Section in a power supply system.


General checks

Make sure available of a fuel tank of enough of fuel. Examine fuel lines on existence of signs of leaks.

Be convinced of that the fuel pump really works. Cock the parking brake and ask the assistant to include ignition, having turned a key in the situation ON, - in a fuel tank the characteristic sound of the working pump (the pump should work about two seconds during which demanded lifting of pressure in a power supply system is carried out) should be heard.

The sound of the working pump is well audible through an open mouth of a fuel tank. If the pump works regularly, however, there are suspicions on violation of serviceability of functioning of a power supply system, measure developed naosy a pressure.


If the pump does not turn on, pass to check of a condition of its electric chain (see. Head Onboard electric equipment). Check the corresponding safety locks and the relay, make sure of serviceability of giving of a food on the pump socket. Estimate quality of grounding.

If a food moves regularly, and quality of grounding is not broken, replace the pump (see. Section Removal and installation of the fuel pump).

Verification of the pressure head characteristic of the fuel pump

For check of pressure of fuel the special manometer with a scale of a wide range and a transitional nozzle for manometer connection to injection system is required.


 PERFORMANCE ORDER

1. Dump pressure in a power supply system (see. Undressed Sbrasyvaniye pressure in a power supply system).

2. Disconnect the final line from the fuel filter, connect between the filter and the fuel highway the three-running union to which connect a manometer. Track reliability of a tightening of shlangovy collars.

3. Switch off everything consumers of the electric power and turn a key in the ignition lock in the situation ON. There should be a 5-second turning on of the fuel pump, - consider the manometer indication. Compare the received result to requirements of Specifications.
4. Start the engine and warm up it on single turns to normal working temperature. Consider the indication of a manometer and compare its value given in Specifications. Disconnect from a pressure regulator the vacuum line (see. The section Removal and installation of a regulator of pressure of fuel), - pressure should increase to value stipulated in paragraph 4.
5. If taken readings do not fall outside the limits the admissible ranges stipulated in Specifications, therefore, the system functions regularly, otherwise, execute the following checks:

a) If pressure is excessively high, check serviceability of giving of depression on a regulator of pressure of fuel. Change of turns of the engine should lead to depression fluctuations. If depression takes place, check passableness and a condition of a hose and a tube of the line of return of fuel. If the returnable line as it should be, replace a pressure regulator;
b) At excessively low pressure, check a condition and passableness of the fuel filter and a gasoline pipe line going from the fuel highway to a fuel tank. If during survey it is not possible to reveal any violations, start the engine and slowly press the returnable line. If pressure increases over 3.0 kgfs/cm 2, replace a pressure regulator (see. Section Removal and installation of a regulator of pressure of fuel).

Do not allow increase of pressure over 4.2 kgfs/cm 2. If pressure still too little, replace the fuel pump (see. Section Removal and installation of the fuel pump);

6. Muffle the engine, having left ignition included. Continue to watch manometer indications within about 5 more minutes - pressure should decrease slowly. If pressure falls excessively quickly, execute the following checks:

a) Without switching off ignition, press the line of supply of fuel on a site between the three-running union and a fuel tank, then switch off ignition, - if pressure falls quickly, leaks through an injector (ы) injection therefore take place;
b) Again include ignition and press submitting line, this time, on a site, between the union and the fuel highway. Switch off ignition, - fast pressure drop testifies to violation of functioning of the control valve of the submersible fuel pump.
7. Having finished check, dump pressure of fuel (see. Undressed Sbrasyvaniye pressure in a power supply system) and disconnect a manometer.