Group 24, Fuel System

Fig 1: Fuel Distributor Pipe

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1. Fuel distribution pipe (fuel gallery)
2. Stopper; in 3 turns (tighten, loosen, tighten) → Tightening torque: 25 Nm (19 ftlb.) 
3. High-pressure sensor → Tightening torque: 20 Nm (15 ftlb.) 

Injectors (high-pressure fuel injectors) 

Fig 2: Identifying Injectors (High-Pressure Fuel Injectors)

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1. Holder
2. Screw, M8 x 30 → Tightening torque: 23 Nm (17 ftlb.) 
3. Injector (high-pressure fuel injector)

Fig 3: Identifying Mount For Fuel Distribution Pipe

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1. Screw, M6 x 16 → Tightening torque: 10 Nm (7.5 ftlb.) 
2. Screw, M6 x 25 → Tightening torque: 10 Nm (7.5 ftlb.) 
3. High-pressure line connection
4. Connection to injector (high-pressure fuel injector); in 3 turns (tighten, loosen, tighten) → Tightening torque: 25 Nm (19 ftlb.) 

Fig 4: Identifying High-Pressure Pump, Turbo Engine

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1. High-pressure pump
2. High-pressure line; (3 turns: tighten, loosen, tighten) → Tightening torque: 25 Nm (19 ftlb.) 
3. Screw, M6, for low-pressure line → Tightening torque: 10 Nm (7.5 ftlb.) 
4. Low-pressure line; (3 turns: tighten, loosen, tighten); counter at hexagon on high-pressure pump → Tightening torque: 25 Nm (19 ftlb.) 
5. Screw socket, M8 → Tightening torque: 23 Nm (17 ftlb.) 
6. Screw socket, M6 → Tightening torque: 10 Nm (7.5 ftlb.) 
7. Protective plate
8. Screw, M6 x 20 → Tightening torque: 10 Nm (7.5 ftlb.) 

Magnifying glass  - Required line distance (5 to 8 mm) between components

Fig 5: Identifying High-Pressure Pump, Naturally Aspirated Engine

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1. High-pressure pump
2. High-pressure line; (3 turns: tighten, loosen, tighten) → Tightening torque: 25 Nm (19 ftlb.) 
3. Screw, M6, for low-pressure line → Tightening torque: 10 Nm (7.5 ftlb.) 
4. Low-pressure line; (3 turns: tighten, loosen, tighten); counter at hexagon on high-pressure pump → Tightening torque: 25 Nm (19 ftlb.) 
5. Screw socket, M8 → Tightening torque: 23 Nm (17 ftlb.) 
6. Screw socket, M6 → Tightening torque: 10 Nm (7.5 ftlb.) 
7. Protective plate
8. Screw, M6 x 20 → Tightening torque: 10 Nm (7.5 ftlb.) 

Magnifying glass  - Required line distance (5 to 8 mm) between components

Fig 6: Tightening Sequence For Intake Module Applies To Naturally Aspirated Engine And Turbo Engine

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Intake module on naturally aspirated engine 

Fig 7: Identifying Intake Module On Naturally Aspirated Engine

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1. Intake module
2. Decoupling module (fastening part); observe correct tightening sequence → Tightening torque: 15 Nm (11 ftlb.) 
3. Screw, 5 x 16 → Tightening torque: 4 Nm (3 ftlb.)  and → Tightening torque: 4 Nm (3 ftlb.) 
4. Pressure sensor
5. Intake module seal; check that seal is aligned and fitted correctly! 
6. Heat socket
7. Screw, 6 x 50 → Tightening torque: 7 Nm (5 ftlb.) 
8. Electronic accelerator
9. Seal
10. Ball socket

Fig 8: Identifying Activating Variable Intake Manifold On Naturally Aspirated Engine

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1. Pipe
2. Connecting piece
3. Variable intake manifold adjuster/adjusting unit
4. Lip seal
5. Connecting element
6. Vacuum unit with cover (actuator)
7. Screw, M5 x 16 → Tightening torque: 4 Nm (3 ftlb.) 
8. Driver
9. Connecting rod
10. Vacuum line

Fig 9: Identifying Intake Air Module On Turbo Engine

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1. Intake module
2. Decoupling module (fastening part); observe correct tightening sequence → Tightening torque: 15 Nm (11 ftlb.) 
3. Screw, 5 x 16 → Tightening torque: 4 Nm (3 ftlb.)  and → Tightening torque: 4 Nm (3 ftlb.) 
4. Pressure sensor
5. Intake module seal; check that seal is aligned and fitted correctly! 
6. Heat socket
7. Screw, 6 x 50 → Tightening torque: 7 Nm (5 ftlb.) 
8. Electronic accelerator
9. Seal
10. Ball socket