A8 Sedan V8-3.7L (AEW) (1997)
Fuel Rail: Service and Repair
LEGEND:
1. Fuel supply line
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25 Nm (18 ft lb.)
2. Fuel return line
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25 Nm (18 ft lb.)
3. Fuel pressure regulator
4. O-ring
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Always replace
5. Vacuum unit for cruise control
6. 20 Nm (15 ft lb.)
7. Retaining clip for fuel injector
8. Air-shrouded fuel injector
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Always replace O-ring
NOTE: When replacing O-ring, do not remove cap.
9. 10 Nm (7 ft lb.)
10. Fuel rail
11. 10 Nm (7 ft lb.)
12. Vacuum hose
13. Retaining clip for fuel pressure regulator
OBSERVE:
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Safety precautions. See: Service Precautions
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Rules of cleanliness. See: Service Precautions/Vehicle Damage Warnings
NOTES:
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Always replace seals and gaskets.
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Before starting repairs,
^
Check Diagnostic Trouble Code (DTC) memory. Refer to "How to Display and Read Diagnostic Trouble Codes" at "On-Board Diagnostics
II". See: Computers and Control Systems/Testing and Inspection
^
Check output Diagnostic Test Mode (DTM). Refer to "Diagnosis With Scan Tool, Address Word 01" at "On-Board Diagnostics II". See:
Computers and Control Systems/Testing and Inspection
REMOVAL: