Service of the Infiniti QX4 since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
5. Cooling system and heating
6. Feed and control systems
6.1. Specifications
6.2. System of the consecutive distributed injection (SFI)
6.3. Dropping pressure in a power supply system of petrol engines
6.4. Check of a state and replacement of fuel lines and their nipple connections
6.5. Systems of electronic control - the general information
6.6. Control system of the VG33E engine. Procedures of diagnostics
7. Systems of start and charge
8. Transmission line
9. Brake system
10. Suspension bracket and steering
11. Body
12. Electric equipment
 












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6.3. Dropping pressure in a power supply system of petrol engines

Remember that gasoline is extremely flammable liquid! During the work with components of a power supply system observe all taken measures of fire safety. Do not smoke! Do not approach the venue of works with naked flame or the carrying unprotected by the lamp shade! You do not make service of system in the rooms equipped with the heating devices using natural gas and equipped with a control torch (such as vodogre and dryers for clothes).


Do not forget that gasoline is among cancerogenic substances — i.e., the substances promoting development of cancer! Try not to allow hits of fuel on open parts of the body — use rubber protective gloves, at casual unforeseen contact with fuel carefully wash hands warm water with soap. Immediately collect the spilled fuel and do not put the rags impregnated with fuel and lubricants near sources of naked flame.


Remember that the power supply system of the models equipped with injection of fuel constantly is under pressure. Before starting a detachment of fuel lines, dump residual pressure in system. At service of components of a power supply system put on goggles. Constantly hold near at hand the class B fire extinguisher!

As it was already mentioned above (see Feed and control systems), the electric fuel pump placed in a tank submersible, the fuel filter, injection injectors, the regulator of pressure and fuel lines connecting the listed components is a part of a power supply system. Fuel in a path of a power supply system at the working engine and the included ignition is under pressure. Residual excessive pressure continues to keep in system during even some time after switching off of ignition and before a detachment components / undocking of nipple sockets has to be dumped.

Dumping of pressure in a power supply system has to be carried out before service of any of its components for the purpose of minimization of risk of ignition of fuel and receiving injuries by the performer.

For dumping of pressure in a power supply system switch off ignition and take from the landing nest in the saloon assembly block a safety lock of the fuel pump, then start the engine and wait for its spontaneous stop — for dumping of residual pressure turn the engine 2-3 more times a starter, then switch off ignition and establish into place a safety lock.



"on the page back
6.2. System of the consecutive distributed injection (SFI)
on the following page"
6.4. Check of a state and replacement of fuel lines and their nipple connections




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