Fuel Injector: Locations

Fuel Rail With High Pressure Pump And Fuel Injectors, Assembly Overview

NOTE:
- Do not disassemble high pressure pump.
- If a fuel injector is removed, Teflon sealing ring of combustion chamber as well as O-ring must always be replaced.
- Read safety precautions before beginning work.
- Observe rules for cleanliness.

CAUTION:
- For reasons of safety, if the battery has not been disconnected, Fuel Pump (FP) fuse must be removed before opening the fuel supply system as the FP will be activated by the drivers door contact switch. Fuse assignment.
- Fuel pressure in high pressure line can be up to 120 bar. Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before loosening the fuel line, place a rag around connection point. Then release pressure by carefully loosening union nuts.







1 - Seal
- Replace
- Before installing, moisten with clean engine oil
2 - Cylinder 1 Fuel Injector N30
- Cylinder 3 Fuel Injector N32
- Cylinder 5 Fuel Injector N83
- The long fuel injectors for cylinders 1, 3 and 5 must not be separated.
3 - Spring element
- Replace for every removal of fuel rail
- Ensure seated tightly
4 - Support washer
- Replace if damaged
5 - O-ring
- Replace
- Before installing, moisten with clean engine oil
6 - 30 Nm plus an additional 1/4 turn (90 degrees)
- Replace
- Tighten fuel rail uniformly, starting from inside and working toward outside
7 - Fuel rail
- For cylinders 1, 3 and 5
- Tighten uniformly, starting from inside and working toward outside
8 - Pressure relief valve
- Lightly coat O-rings with clean engine oil before installing
- Replace removed valve
- Press in by hand using 8 mm hex wrench
9 - 22 Nm
10 - High pressure fuel line, 22 Nm
- Fuel pressure in high pressure line can be up to 120 bar. Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before loosening fuel lines, place a rag around connection point. Then release pressure by carefully loosening union nuts.
- To loosen and tighten union nut, counter hold on connection of high pressure pump using a wrench.
- Before installing: First tighten connection at high pressure pump to 40 Nm.
- Do not install when under tension
- To install, first tighten union nuts by hand.
11 - Low pressure fuel line, 27 Nm
- To loosen and tighten union nut, counter hold on connection of high pressure pump using a wrench.
- Before installing: First tighten connection at high pressure pump to 28 Nm.
- Do not install when under tension
- To install, first tighten union nuts by hand.
12 - Low Fuel Pressure Sensor G410, 15 Nm
13 - 10 Nm
14 - High pressure pump
- With Fuel Pressure Regulator Valve N276
- To loosen and tighten fuel lines, counter hold on connection using a wrench.
- Before installing fuel lines, first tighten connection for fuel lines:
- Connection for high pressure line: 40 Nm
- Connection for low pressure line: 28 Nm
15 - Lifter
- Lubricate O-rings with clean engine oil before installing
16 - Fuel Pressure Sensor G247, 22 Nm
- Before assembly, coat front sealing point and threads with clean motor oil.
17 - Fuel rail
- For cylinders 2, 4 and 6
- Tighten uniformly, starting from inside and working toward outside
18 - Cylinder 2 Fuel Injector N31
- Cylinder 4 Fuel Injector N33
- Cylinder 6 Fuel Injector N84
19 - Connecting line, 22 Nm
- Do not install when under tension
- To install, first tighten union nuts by hand.
20 - Fuel supply hose, 22 Nm
- From fuel tank
- To loosen and tighten union nut, counter hold on supply line of fuel rail using a wrench.