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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Engine Performance System Removal, Overhaul & Installation - Bi-Fuel) >> Fuel Systems >> High Pressure Regulator >> Removal & Installation

Removal & Installation

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Disconnect the negative battery cable. Clamp off coolant hoses using coolant hose pinch pliers. Remove hose clamps and hoses from the high pressure regulator coolant fittings. Remove the fuel inlet line from the high pressure regulator. Remove the fuel outlet line from the high pressure regulator.
    2. WARNING: Do not hold the High Pressure Regulator (HPR) using the hex flange at the end of the HPR near the warning label. Place the HPR in a suitable holding device in order to keep the HPR from spinning in the bracket.
  2. Remove the bolts from the electronic brake control module shield and remove the shield. Loosen, but do not remove, the lower bracket mounting bolt. Remove the high pressure regulator mounting bracket thru-frame nut and bolt. Remove the high pressure regulator and bracket assembly from the vehicle. Remove the fuel inlet line fitting from the high pressure regulator. Retain the high pressure regulator fuel filter and spring for re-installation if clean. Remove the high pressure regulator jam nut and remove the high pressure regulator from the bracket.
    3. WARNING: When replacing HPR, Apply pipe thread sealant containing Teflon(R) prior to installation. Do not use Teflon(R) tape.
  3. To disassemble for replacement, place the HPR in a suitable holding device in order to keep the HPR from moving. Remove the coolant hose fittings. Remove the Pressure Relief Device (PRD). Remove the fuel outlet fitting. To assemble new component, install the fuel outlet fitting. Tighten the fitting finger-tight plus 1 to 3 turns. Install the Pressure Relief Device (PRD). Tighten the PRD finger-tight plus 1 to 3 turns. Install the coolant hose fittings. Tighten the coolant hose fittings finger-tight plus 1 to 3 turns as required to properly align the fittings.
    4. NOTE: Ensure that a clean or new fuel filter and the spring and gasket are installed prior to installation of the fuel inlet fitting.
  4. To install, install the high pressure regulator into the bracket and install the high pressure regulator jam nut. Tighten the jam nut. See TORQUE SPECIFICATIONS  . Lubricate the "O" rings with petroleum jelly or equivalent before installation. Install the fuel inlet fitting using NEW "O" rings.
  5. Tighten the fuel inlet fitting. See TORQUE SPECIFICATIONS  . Place the high pressure regulator and bracket assembly onto the loosely installed lower mounting bracket bolt. Install the thru-frame mounting bracket nut, washer and bolt. Tighten the thru-frame nut. Tighten the lower bracket mounting bolt. Tighten the mounting bolt. Install the electronic brake control module shield and bolts. Tighten the shield mounting bolts. Connect the fuel outlet line to the outlet line fitting using a NEW "O" ring. Lubricate "O" ring with petroleum jelly or equivalent before installation. Tighten the fuel outlet line fitting finger-tight plus 1 to 3 turns.
  6. Install the fuel inlet line to the fuel inlet fitting. Tighten the fuel inlet line fitting. Install the coolant hoses and clamps to the high pressure regulator coolant fittings. Remove the coolant hose pinch pliers. Connect the negative battery cable. Prime the CNG fuel system by cycling the ignition ON and OFF several times. Start the engine and use Ultrasonic Leak Detector (J 41416) in order to inspect for CNG fuel system leaks at each serviced fitting. Inspect for proper coolant level and fill as necessary. See COOLING SYSTEM BLEEDING  under COOLING SYSTEM.
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