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Fill Line Union (Check Valve): 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.
  1. Install the fill line union (check valve) using NEW "O" ring face seals. Lubricate the "O" rings with petroleum jelly, or equivalent. Tighten the fill line union fittings to specification. See TORQUE SPECIFICATIONS .
  2. Connect the negative battery cable. Tighten to specification. See TORQUE SPECIFICATIONS .
  3. Connect the three harness connectors and the HPL harness connector.
  4. Start the engine. Check for CNG fuel leaks at each serviced fitting using the Combustible Gas Detector (J 45878).
  5. Slip the tank vent boot over the union. Tighten the boot clamp to specification. See TORQUE SPECIFICATIONS .
  6. Install the tank vent boot cover. Tighten the tank vent boot cover nuts to specification. See TORQUE SPECIFICATIONS .
  7. Install the fuel tank cover.
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