Schematic overview - fuel system

To prevent the high-pressure fuel pump from running while it is empty and to ensure that the engine starts quickly after parts have been renewed, it is important to observe the following:

• If fuel system components between fuel tank and fuel highpressure pump are removed or renewed;
• If a fuel pump, fuel line or fuel filter is removed or replaced.
• If the fuel high-pressure pump is removed or replaced

• Connect vehicle diagnostic tester.
• Perform the function “Fuel pump activation (Filling/bleeding fuel system)” in “Guided Functions” ⇒ 1.3 Filling/bleeding fuel system.

• 1 Fuel metering valve - N290-
  • Do not open.
• 2 High-pressure pump
  • After renewing, a first fuel filling “must” be performed (never allow pump to run while dry) ⇒ 1.3 Filling/bleeding fuel system.
  • Removing and installing ⇒ 4.1 Assembly overview - high-pressure pump
• 3 Fuel pressure sender - G247-
  • Installing and removing ⇒ 5.2 Checking fuel pressure regulating valve - N276-
• 4 High-pressure accumulator (rail)
  • Removing and installing ⇒ 3.6 Assembly overview - fuel rail
• 5 Fuel pressure regulating valve - N276-
  • Renew
  • Checking ⇒ 5.1 Removing and installing fuel pressure regulating valve - N276-
  • Removing and installing ⇒ 5 Senders and sensors
  • 80 Nm
• 6 Injectors
  • Injector for cylinder 1 - N30-
  • Injector for cylinder 2 - N31-
  • Injector for cylinder 3 - N32-
  • Installing and removing ⇒ 3.3 Checking return flow rate of injectors with engine running
• 7 Fuel return lines
  • The fuel return lines must not be dismantled.
• 8 Fuel
  • With fuel delivery unit - G6-.
  • If fitted: supplementary fuel filter and integrated pressure control valve
  • Removing and installing ⇒ fuel supply system; Rep. gr. 20.
• 9 Fuel supply and return line separating points
  • On bottom right of fuel tank.
• 10 Fuel filter
  • Assembly overview - fuel filter ⇒ fuel supply system; Rep. gr. 20.
  • Removing and installing ⇒ fuel supply system; Rep. gr. 20.