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Fuel Pressure Relief (With CH 48027): Procedure

    Fig 1: View Of Digital Pressure Gauge, Special Tools & Components
    GM1828580Courtesy of GENERAL MOTORS CORP.
  1. Remove the engine cover, if required.
  2. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
  3. Remove the fuel rail service port cap.
    4. WARNING: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.
  4. Wrap a shop towel around the fuel rail service port.
  5. Connect the J 42242  to the fuel rail service port. See Special Tools .
  6. Connect the CH-48027-3 (4) to the J 42242  . See Special Tools .
  7. Connect the CH-48027-2 (2) to the CH-48027-3 (4).
  8. Place the hose on the CH-48027-2 (2) into an approved gasoline container.
  9. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail.
  10. Close the valve on the CH-48027-2 (2).
  11. Remove the hose on the CH-48027-2 (2) from the approved gasoline container.
    12. CAUTION: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:
    • The fuel pipe connections
    • The hose connections
    • The areas surrounding the connections
    NOTE: If relieving the fuel pressure for the fuel pressure gage installation and removal, it is NOT necessary to proceed with the following steps.
  12. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
  13. Disconnect the CH-48027-3 (4) from the J 42242  . See Special Tools .
  14. Disconnect the J 42242  from the fuel rail service port. See Special Tools .
  15. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
  16. Install the fuel rail service port cap.
  17. Install the engine cover, if required.
  18. Tighten the fuel fill cap.
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