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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 973 (Engine Controls - 4.8L, 5.3L, & 6.0L (Introduction)) >> Repair Instructions >> Fuel Hose/Pipes Replacement - Chassis (Pickup - 5.3L (L59) Engine) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Clean all fuel pipe connections and surrounding areas before disconnecting the pipes in order to avoid possible fuel system contamination.
  1. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief Procedure .
  2. Disconnect the fuel feed and return pipes (1) at the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  3. Disconnect the evaporative emission (EVAP) canister purge tube (3). Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    4. Fig 1: View Of EVAP/Fuel Hose/Pipes
    GM856643Courtesy of GENERAL MOTORS CORP.
  4. Cap the fuel rail and EVAP pipes.
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  6. Remove the fuel pipe bracket nut (2).
  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 hose/pipe clip from the bracket on the automatic transmission.
    10. Fig 2: Fuel Hose/Pipe Clip At Bracket On Automatic Transmission
    GM300385Courtesy of GENERAL MOTORS CORP.
  10. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe 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. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (Pickup)  or Evaporative Emission (EVAP) Canister Replacement (Pickup - 5.3L (L59) Engine)  or Evaporative Emission (EVAP) Canister Replacement (1500 Crew Cab)  or Evaporative Emission (EVAP) Canister Replacement (Cab/Chassis) .
    14. IMPORTANT: The area around the electro-hydraulic control unit (EHCU) MUST be free from loose dirt to prevent contamination of disassembled anti-lock brake components (ABS) components.
  14. Thoroughly wash all contaminants from around the EHCU.
  15. Disconnect the chassis electrical harness connectors from the electronic brake control module (EBCM).
    16. Fig 3: Identifying Chassis Electrical Connectors To EBCM
    GM924296Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Make sure that brake lines are tagged and kept in order for proper reassembly.
  16. Disconnect the brake lines from the brake pressure modulator valve (BPMV).
  17. Remove the bolts (4) attaching the EHCU bracket to the frame (5).
  18. Remove the EHCU (1).
    19. Fig 4: View Of EBCM/EHCU Assembly
    GM379478Courtesy of GENERAL MOTORS CORP.
  19. If equipped with 4WD, remove the torsion bar bracket. Refer to Torsion Bar Replacement in Front Suspension.
  20. Disconnect the fuel feed and return pipes at the fuel tank. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    21. Fig 5: Fuel Feed And Return Line Quick Connect Fittings
    GM878130Courtesy of GENERAL MOTORS CORP.
  21. Cap the fuel pipes at the fuel tank.
  22. If vehicle is a regular cab, remove the fuel feed, EVAP, and return pipe assembly nuts.
    23. Fig 6: Fuel Feed, EVAP And Return Pipe Assembly (Regular Cab)
    GM878115Courtesy of GENERAL MOTORS CORP.
  23. If vehicle is a crew or extended cab, remove the fuel feed, EVAP, and return pipe assembly nuts.
  24. Remove the fuel feed, EVAP, and return pipe assembly.
    25. Fig 7: Fuel Feed, EVAP And Return Pipe Assembly (Extended Cab)
    GM878119Courtesy of GENERAL MOTORS CORP.
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