audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Removing and installing pressure differential senderG505 > < Removing and installing fuel pressure regulating valveN276

A5

Removing and installing fuel pressure senderG247
Removing and installing fuel pressure sender -G247-
Special tools and workshop equipment required
   
t  Bit (27 mm) -T40218- or commercially available socket (27 mm)
t  Torque wrench
  Note
t  The fuel pressure sender -G247- continuously measures the fuel pressure in the high-pressure system. It transmits a corresponding voltage signal to the engine control unit -J623-.
t  Should the fuel pressure sender fail, the engine control unit will control the fuel pressure via a mapped open-loop backup function. Maximum engine speed in this mode is restricted.
t  The fuel pressure sender -G247- has a deformable sealing lip.
Removing
  Caution
Risk of malfunctions caused by dirt.
Observe → Chapter.
–  Pull off engine cover panel → Chapter.
–  Clean thread and area all around fuel pressure sender with engine cleaner or brake cleaner and dry.
  Note
Clean carefully; cleaning solution must not enter the electrical connector.
  W00-10779
–  Unplug electrical connector at fuel pressure sender -G247--arrow-.
–  Unscrew fuel pressure sender -G247- using socket, 27 mm -T40218-.
  Note
An open-end spanner must not be used for loosening or tightening.
–  Remove dirt from opening in fuel rail using a vacuum cleaner. Do not use metal tools, etc.
Seal off opening in fuel rail immediately with a suitable plug to prevent dirt from entering.
Installing
Installation is carried out in the reverse order; note the following:
  Note
t  If the deformable sealing lip and the thread of the fuel pressure sender -G247- are not damaged, the sender can be re-used once.
t  Check that the deformable sealing lip and the thread on the new fuel pressure sender -G247- are not damaged.
t  Check sealing surface at opening in fuel rail.
t  The beginning of the thread and the deformable sealing lip of the fuel pressure sender -G247- must be coated with diesel fuel.
–  Screw in fuel pressure sender -G247- by hand.
–  Then tighten fuel pressure sender -G247- to specified torque.
l  Note tightening sequence and tightening torque → Fig..
After installing fuel pressure sender -G247-, leave engine running at moderate speed for a few minutes when bleeding fuel system and then switch off again.
  Note
The fuel system is „self-bleeding“; do NOT open the high-pressure connections.
–  Interrogate event memory.
–  Switch off ignition.
–  Carefully check the entire fuel system for leaks.
Renew affected component if leakage still occurs after tightening to correct torque.
–  After completing the repair, road-test the vehicle. Accelerate with full throttle at least once. Then check the high-pressure section of the fuel system again for leaks.
  Note
If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off the engine and erase the event memory. Then continue the road test.
–  After road test, interrogate event memory again.
  A23-10535

Removing and installing pressure differential senderG505 > < Removing and installing fuel pressure regulating valveN276