Audi A3 Sportback, Сервисная инструкция, Страница: 35 / 60

35
Fuel supply
The new direct-injection petrol engines are supplied by a demand-controlled fuel pump. This demand control
was developed to minimise the energy demand of the fuel pump and save fuel.
The fuel pump supplies only as much fuel as is required by the engine while maintaining the required system
pressure. This task is performed by the Engine Control Unit (ECU) and an electronic power module which
controls fuel pump speed by pulse width modulation.
332_078
332_073
High-pressure injector
Fuel pressure sender G247
Pressure limiting valve
High-pressure fuel circuit
Low-pressure fuel circuit
Fuel pressure sender,
low pressure
G410
High-pressure pump
Fuel pressure control valve N276
Triple pump cam
Fuel delivery unit with fuel tank sender
Fuel demand control system
Fuel filter with
pressure limiting valve
Electronic power module
0.5 - 5 bar
ECU
Hitachi high-
pressure pump
Pressure sensor
Injectors
Rail pressure 50 - 110 bar
Short return line
Electrical fuel delivery
Pressure sensor
Suspension strut
turret
Injection system
Pressure control valve for
pressures exceeding 120
bar