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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 43 (ENGINE CONTROLS REMOVAL & INSTALLATION)FUEL SYSTEMS (CNG ENGINE)FUEL TANK (CNG)REMOVAL & INSTALLATION
2001 Chevrolet Cavalier LS, 2.4 T

Removal & Installation

2001 Chevrolet Cavalier LS, 2.4 TSECTION Removal & Installation
WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vent CNG fuel tank. See FUEL TANK VENTING (CNG) .
  2. Remove the trunk trim panel. Remove the cargo net, the cargo net knobs and the left wheelhouse carpet.
  3. Lower the rear seat. Loosen the vent hose clamps at the tank vent boot and the High Pressure Regulator (HPR) mounting ring. See Figure. Pull up the boot and loosen the fuel line at the HPR. Remove the lines and the vent boot as an assembly.
  4. Remove spare tire bracket. Mark tank in 2 places, approximately 180 degrees apart for reference. Remove and discard tank strap nuts and bolts. Remove clevis and bridge pins.
  5. Remove tank straps. Position CNG Tank Restrainer (J 43133) into tank strap bolt holes. See Fig 1.
  6. Loop restrainer straps around tank and secure straps to the tool. Pull back restrainer to pull tank free from bracket. Pull back on straps to roll tank to upper level of restrainer. Use a lifting device and CNG Tank Lifting Apparatus (J 45529) to remove tank from vehicle. See Fig 1.
  7. Unscrew and remove HPL and "O" ring from tank. Check inside of tank for debris or excess water accumulation. Clean CNG fuel tank if necessary using clean water. Dry CNG fuel tank using compressed air. To install, reverse removal procedure. Use a new "O" ring. Tighten all fasteners to specification. See TORQUE SPECIFICATIONS . Start the engine. Using Ultrasonic Leak Detector (J 41416), check for CNG fuel leaks at each serviced fitting.
Fig 1: Removing CNG Fuel Tank
G00071011Courtesy of GENERAL MOTORS CORP.
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.