GM Service Manual Online
For 1990-2009 cars only

Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank Vapor Pipe

Removal Procedure

Caution: In order to reduce the risk of fire and personal injury observe the following items:

   • Replace all nylon fuel pipes that are nicked, scratched or damaged during installation, do not attempt to repair the sections of the nylon fuel pipes
   • Do not hammer directly on the fuel harness body clips when installing new fuel pipes. Damage to the nylon pipes may result in a fuel leak.
   • Always cover nylon vapor pipes with a wet towel before using a torch near them. Also, never expose the vehicle to temperatures higher than 115°C (239°F) for more than one hour, or more than 90°C (194°F) for any extended period.
   • Apply a few drops of clean engine oil to the male pipe ends before connecting fuel pipe fittings. This will ensure proper reconnection and prevent a possible fuel leak. (During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated.)

Notice: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:

   • The fuel pipe connections
   • The hose connections
   • The areas surrounding the connections

  1. Remove the fuel tank. Refer to Fuel Tank Replacement .

  2. Object Number: 730888  Size: SH
  3. Disconnect the evaporative emission (EVAP) vapor pipe at the fill limiter vent valve (3).
  4. Disconnect the EVAP vapor pipe from the front rollover valve (5).
  5. Remove the front retaining clip (6) from the fuel and EVAP pipes and remove the EVAP vapor pipe.
  6. Disconnect the EVAP vapor pipe from the fill limiter vent valve (3).
  7. Disconnect the EVAP vapor pipe from the rear rollover valve (2).
  8. Remove the EVAP vapor pipe.

Installation Procedure


    Object Number: 730888  Size: SH
  1. Connect the fuel tank vapor pipe to the rear rollover valve (2).
  2. Connect the fuel tank vapor pipe to the fill limiter vent valve (3).
  3. Connect the EVAP vapor pipe to the fill limiter vent valve (3).
  4. Install the front clip (6) to the fuel and EVAP pipes at the front of the fuel tank.
  5. Connect the EVAP vapor pipe to the front rollover valve (5).
  6. Install the fuel tank. Refer to Fuel Tank Replacement .

Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank Vent Pipe

Removal Procedure

Caution: In order to reduce the risk of fire and personal injury observe the following items:

   • Replace all nylon fuel pipes that are nicked, scratched or damaged during installation, do not attempt to repair the sections of the nylon fuel pipes
   • Do not hammer directly on the fuel harness body clips when installing new fuel pipes. Damage to the nylon pipes may result in a fuel leak.
   • Always cover nylon vapor pipes with a wet towel before using a torch near them. Also, never expose the vehicle to temperatures higher than 115°C (239°F) for more than one hour, or more than 90°C (194°F) for any extended period.
   • Apply a few drops of clean engine oil to the male pipe ends before connecting fuel pipe fittings. This will ensure proper reconnection and prevent a possible fuel leak. (During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated.)

Notice: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:

   • The fuel pipe connections
   • The hose connections
   • The areas surrounding the connections

  1. Remove the fuel tank. Refer to Fuel Tank Replacement .

  2. Object Number: 730717  Size: SH
  3. Disconnect the evaporative emission (EVAP) vent pipe (3) from the EVAP canister vent valve (1).
  4. Remove the EVAP vent pipe from the fuel tank retainers.

Installation Procedure


    Object Number: 730717  Size: SH
  1. Install the EVAP vent pipe to the fuel tank retainers.
  2. Connect the EVAP vent pipe (3) to the EVAP canister vent valve (1).
  3. Install the fuel tank. Refer to Fuel Tank Replacement .