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Component Overview

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying DFI Injection System (3.6L)
G09410132Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  1. Sealing ring on long fuel injectors for cylinders 1, 3 and 5; replace; coat with clean engine oil
  2. Long fuel injectors for cylinders 1, 3 and 5 Long fuel injectors must not be disassembled! 
  3. Spring element; replace; ensure secure seating
  4. Support washer; replace if damaged
  5. Sealing ring; not used on the Cayenne
  6. Screw M8 x 55; replace; tighten fuel distributor evenly from the inside out; → Tightening torque: 30 Nm (22 ftlb.)  , then → Torque angle: 90° 
  7. Fuel distributor for cylinders 1, 3 and 5; the spring elements of the fuel injectors must always be replaced before installation; tighten evenly from the inside out
  8. from fuel tank
  9. Fuel supply hose (low-pressure line); counter with a wrench at the supply line of the fuel distributor when loosening and tightening the union nut; pay attention to marking
  10. Pressure control valve; replace removed valve; press in by hand using 8 mm hexagon wrench
  11. → Tightening torque: 22 Nm (16 ftlb.) 
  12. Fuel high-pressure line → Tightening torque: 22 Nm (16 ftlb.)  ; the fuel pressure in the high-pressure line can reach 120 bar! Wear goggles and protective clothing to prevent injury and skin contact. Place a cloth around the connection before loosening the fuel lines. Then release pressure by carefully loosening the union nuts; counter with a wrench at the adapter for the high-pressure pump when loosening and tightening the union nut; before installation: first re-tighten the adapter at the high-pressure pump → Tightening torque: 40 Nm (30 ftlb.)  ; do not install too tightly; to install, first tighten the union nuts by hand
  13. Fuel low-pressure line → Tightening torque: 27 Nm (20 ftlb.)  ; counter with a wrench at the adapter for the high-pressure pump when loosening and tightening the union nut; before installation: first re-tighten the adapter at the high-pressure pump; → Tightening torque: 28 Nm (21 ftlb.)  ; do not install too tightly; to install, first tighten the union nuts by hand
  14. Fuel pressure sensor for low pressure; not installed in the Cayenne
  15. → Tightening torque: 10 Nm (7.5 ftlb.) 
  16. High-pressure pump; with control valve for fuel pressure; counter with a wrench at the adapter when loosening and tightening the fuel lines;
  17. Tappet; coat with clean engine oil before installing
  18. Fuel pressure sensor → Tightening torque: 22 Nm (16 ftlb.)  ; coat front sealing ball and thread with clean engine oil before fitting
  19. Fuel distributor for cylinders 2, 4 and 6; the spring elements of the fuel injectors must always be replaced before installation; tighten evenly from the inside out
  20. Short fuel injectors for cylinders 2, 4 and 6
  21. Connecting line; do not install too tightly; to install, first tighten the union nuts by hand; → Tightening torque: 22 Nm (16 ftlb.) 
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