Audi A4, S4

since 2000 of release

Repair and car operation

Audi A4, S4
+ Introduction
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
+ Systems of cooling, heating and air conditioner
- Power supply systems, release and decrease in toxicity of the fulfilled gases
   - Power supply systems of petrol and diesel engines
      General information and security measures
      Sbrasyvaniye of pressure in fuel system
      Removal and installation of the fuel pump with the sensor of a stock of fuel
      Air removal from fuel system (the petrol engine of 1.8 l)
      Removal and installation of the fuel filter
      Removal and installation of the air filter
   + System of injection of fuel of the petrol engine
   + System of injection of fuel of the diesel engine
   + Systems of release and decrease in toxicity of the fulfilled gases. Turbokompressor
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Sbrasyvaniye of pressure in fuel system

Before starting to work, familiarize with the precautionary measures given in the section General information and security measures.

After performance described below procedure you only will remove superfluous pressure in fuel system. In pipelines there will be a gasoline. Before disconnecting any fuel hose, accept all necessary precautionary measures.

The fuel system considered in this Chapter, consists of the fuel tank located in it of the fuel pump with the sensor of a stock of fuel, the fuel filter, injectors or nozzles, a regulator of pressure and various hoses and tubes. In all these knots in engine operating time (and also at the included ignition) fuel is under pressure.

After ignition switching off pressure in system remains still quite long time. Before a detachment of any of mentioned above the component is necessary for removing pressure.

For this purpose quickly open a cover of a fuel tank and again close it. Put on connection a thick rag. Use goggles. In system of direct injection of the AWA engine by the described image pressure only regarding the system having low pressure (to 6 atm can be removed.). For removal of a high pressure (to 110 atm.) special devices are required. The high pressure in system is present at area from TNVD to nozzles. At the diesel engine of 1.9 l the temperature of fuel pipelines and fuel at the engine about the pump nozzles in extreme cases can make to 100°С. Before opening of connections, let's to fuel cool down, since otherwise it can occur a burn.

The simplest way of dumping of pressure is following. Take a safety lock of the fuel pump and start the engine. If the engine is not started, turn it a starter within several seconds and if it will be started, allow the engine to work at single turns until he will not decay. Completely to dump pressure, turn the engine crankshaft a starter on pair of turns. Switch off ignition and return into place a pump safety lock.

Keep in mind that if pressure is dumped (or from system is removed fuel), start of the engine will borrow bigger, than usually, time. You should turn the engine crankshaft a starter at least some seconds during which pressure in system will be restored, and fuel will fill all pipelines.