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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1168 (Engine Controls - 6.0L - Alternative Fuels (Introduction)) >> Repair Instructions >> Low Pressure Lock-Off (LPL) Solenoid Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Line Union, IPR and LPL
    GM762374Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Apply pipe thread sealant with Teflon® to the threads of the line union (2). Do not use Teflon® tape.
  1. While holding the line union (2) rotate and install the IPR (3) or the LPL (1) as required.

    Tighten:  Tighten the IPR or LPL hand tight plus one to three turns as required to align the IPR/LPL assembly to the bracket.

    2. Fig 2: Identifying IPR/LPL Assembly Components
    GM762368Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the IPR/LPL assembly (1, 4) to the mounting plate (2) using the attaching bolts (3).

    Tighten:  Tighten the bolts to 12 N.m (9 lb ft).

    3. Fig 3: Identifying IPR/LPL Bracket Components
    GM756975Courtesy of GENERAL MOTORS CORP.
  3. Install the IPR/LPL bracket (4) to the engine (2) using the attaching nuts (3).

    Tighten:  Tighten the nuts to 12 N.m (9 lb ft).

    4. Fig 4: Identifying IPR Fuel Outlet Lines Components
    GM757010Courtesy of GENERAL MOTORS CORP.
  4. Connect the IPR fuel outlet lines (5, 8) to the IPR (2) using new O-rings (3). Lubricate the O-ring with petroleum jelly.
  5. Install the line hold-down bracket (4) and nut (6).

    Tighten:  Tighten the nut to 9 N.m (80 lb in).

    6. Fig 5: Identifying Low Pressure Lock-Off (LPL) Solenoid Components
    GM756969Courtesy of GENERAL MOTORS CORP.
  6. Connect the LPL electrical connector (5).

    Connect the fuel inlet line (1) to the LPL fitting (2) using a new O-ring face seal. Lubricate the O-ring with petroleum jelly.

    Tighten:  Tighten the fitting to 37 N.m (27 lb ft).

    7. CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  7. Install the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical in the C/K Pickup service manual.
  8. Start the vehicle and inspect for CNG fuel leaks at the serviced fitting using the J 45878  or an equivalent liquid leak detector. See Special Tools and Equipment .
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