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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1565 (Engine Control System & Fuel System - 4.8L, 5.3L, 6.0L, 6.2L - Repair Instructions) >> Repair Instructions >> Auxiliary Fuel Tank Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Auxiliary Fuel Tank & Straps
    GM2100530Courtesy of GENERAL MOTORS CORP.
  1. Install the fuel pump module to the fuel tank. Refer to Fuel Tank Fuel Pump Module Replacement (25 Ext/Crew Cab With 26 Gal Tank)  or Fuel Tank Fuel Pump Module Replacement (15/25 Reg/Ext/Crw Cab With 34 Gal Tnk)  or Fuel Tank Fuel Pump Module Replacement (15 Ext/Crew Cab With 26 Gal Tank)  or Fuel Tank Fuel Pump Module Replacement (15 Reg Cab With 26 Gal Tank)  or Fuel Tank Fuel Pump Module Replacement (35 Reg/Ext/Crew Cab With 34 Gal Tank) .
  2. Remove the caps from the fuel and EVAP pipes.
  3. With the aid of an assistant, support and partially raise the fuel tank.
  4. Connect the electrical connectors.
  5. Connect the evaporative emissions lines and the fuel lines. Refer to Metal Collar Quick Connect Fitting Service  and Plastic Collar Quick Connect Fitting Service 
  6. With the aid of an assistant, support the auxiliary fuel tank.
  7. Install the auxiliary fuel tank (1).
    8. CAUTION: Refer to Fastener Caution .
  8. Install the fuel tank strap attaching bolts (2) and tighten to 40 N.m (30 lb ft).
    9. Fig 2: View Of Auxiliary Fuel Tank Fill Pipe, Vent Pipe & Clamps
    GM2100438Courtesy of GENERAL MOTORS CORP.
  9. Connect and tighten the fuel fill (1) and vent pipe (2) hose clamps to 4 N.m (35 lb in).
    10. Fig 3: View Of Auxiliary Fuel Tank & Bolts
    GM2100432Courtesy of GENERAL MOTORS CORP.
  10. Install the fuel tank shield (2) and the fuel tank shield bolts (1) and tighten to 18 N.m (13 lb ft).
  11. Refill the fuel tank.
  12. Install the fuel filler cap.
  13. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Single Battery) or Battery Negative Cable Disconnection and Connection (Dual Batteries) or Battery Negative Cable Disconnection and Connection (Auxiliary Battery) in Engine Electrical.
  14. Use the following procedure in order to inspect for leaks:
    1. Turn ON the ignition, with the engine OFF, for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition, with the engine OFF.
    4. Inspect for fuel leaks.
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