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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - 4.3L - Introduction (2 Of 2)) >> Repair Instructions >> Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine/Chassis >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
  2. Disconnect the chassis fuel feed line at the engine fuel line (1). Refer to Quick Connect Fitting(s) Service (Metal Collar) .
    Fig 1: Disconnecting Chassis Fuel Feed Line
    GM1528274Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the EVAP line (3). Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
  4. Cap the engine fuel line (1), and EVAP line (3) in order to avoid possible system contamination.
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  6. Remove the fuel pipe bracket nut.
    Fig 2: View Of Fuel Pipe Bracket & Nut At Bellhousing
    GM1238747Courtesy of GENERAL MOTORS CORP.
  7. Remove the fuel pipe bracket from the bellhousing stud.
  8. Remove the heated oxygen sensor (HO2S) sensor connector from the bracket.
  9. Remove the fuel line clip from the bracket on the transmission.
    Fig 3: Removing Fuel Line Clip From Bracket At Transmission
    GM1549620Courtesy of GENERAL MOTORS CORP.
  10. If equipped with 4-wheel drive (4WD), remove the fuel line clip from the bracket on the transfer case.
  11. Remove the clip from the bracket on the frame.
  12. Remove the transfer case harness from the clip bracket.
    13. IMPORTANT: The area around the electro-hydraulic control unit (EHCU) MUST be free from loose dirt to prevent contamination of disassembled anti-lock brake (ABS) components.
  13. Thoroughly wash all contaminants from around the EHCU.
  14. Disconnect the chassis electrical harness connectors from the electronic brake control module (EBCM).
    Fig 4: Identifying Chassis Electrical Connectors To EBCM
    GM924296Courtesy of GENERAL MOTORS CORP.
    15. IMPORTANT: Make sure the brake lines are tagged and kept in order for proper reassembly.
  15. Disconnect the brake lines from the brake pressure modulator valve (BPMV).
  16. Remove the bolts (4) attaching the EHCU bracket to the frame (5).
  17. Remove the EHCU (1).
    Fig 5: View Of EBCM/EHCU Assembly
    GM379478Courtesy of GENERAL MOTORS CORP.
  18. If equipped with 4WD, remove the torsion bar bracket. Refer to Torsion Bar Replacement in Front Suspension.
  19. Disconnect the fuel and EVAP lines at the fuel tank. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    Fig 6: Fuel And EVAP Lines At The Fuel Tank
    GM1238591Courtesy of GENERAL MOTORS CORP.
  20. Cap the fuel and EVAP lines at the fuel tank in order to avoid possible system contamination.
  21. Remove the fuel and EVAP bundle clip nuts.
  22. Remove the fuel and EVAP bundle.
    Fig 7: Removing Fuel & EVAP Bundle
    GM1238831Courtesy of GENERAL MOTORS CORP.
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