Low Pressure Regulator: Installation

2004 Oldsmobile Bravada AWDSECTION Installation
WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Prior to installing the LPL coat the threads of the union with pipe thread sealant containing Teflon. DO NOT use Teflon tape.
  1. While holding the union with a wrench, rotate the LPL as necessary to attach the components. Tighten the LPL 1-3 turns from hand tight as necessary to properly align and seal the LPL and LPR to the union. See Figure.
  2. Loosely install the LPR mounting bolts through the mounting bracket and into the LPR.
  3. Loosely install the LPL mounting bolts through the mounting bracket and into the LPR. Tighten the mounting bolts to specification. See TORQUE SPECIFICATIONS .
  4. Place the LPR/LPL mounting bracket onto the transmission housing studs. See Figure.
  5. Install the LPR/LPL mounting nuts (3) onto the mounting studs. Tighten the nuts to specification. See TORQUE SPECIFICATIONS .
  6. Install the fuel feed hose at the regulator using a NEW "O" ring. Lubricate the "O" ring with petroleum jelly, or equivalent.
  7. Install the fuel hose retainer and the hold-down nut. Tighten the nut to specification. See TORQUE SPECIFICATIONS .
  8. Install the fuel line to the LPL fuel inlet elbow using a NEW "O" ring face seal. Lubricate the "O" ring face seal with petroleum jelly, or equivalent. Tighten the fuel line fitting to specification. See TORQUE SPECIFICATIONS .
  9. Connect the LPL harness connector.
  10. Install the battery, air cleaner outlet duct and the air cleaner assembly.
  11. Start the engine. Check for CNG fuel leaks at each serviced fitting using the Combustible Gas Detector (J 45878).
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.