GM Service Manual Online
For 1990-2009 cars only

Evaporative Emission System Hoses/Pipes Replacement Vacuum Supply

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.)


    Object Number: 43560  Size: SH
  1. Remove the left engine sight cover.

  2. Object Number: 1481776  Size: SH
  3. Disconnect the quick-connect fittings at the throttle body (6) and the evaporative emission (EVAP) canister purge valve (7). Refer to Plastic Collar Quick Connect Fitting Service .
  4. Remove the EVAP pipe (3).

Installation Procedure


    Object Number: 1481776  Size: SH
  1. Reconnect the EVAP pipe (3) to the throttle body (6).
  2. Reconnect the EVAP pipe (3) to EVAP canister purge valve (7).

  3. Object Number: 43560  Size: SH
  4. Install the left engine sight cover.

Evaporative Emission System Hoses/Pipes Replacement Engine Purge 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.)


    Object Number: 43560  Size: SH
  1. Remove the left engine sight cover.

  2. Object Number: 1481776  Size: SH
  3. Disconnect the quick-connect fittings at the evaporative emission (EVAP) canister purge valve (7). Refer to Plastic Collar Quick Connect Fitting Service .
  4. Remove the EVAP pipe (2).

Installation Procedure


    Object Number: 1481776  Size: SH
  1. Install the EVAP pipe (2) to the EVAP canister purge valve (7).
  2. Connect the EVAP pipe (2) to the connection for the canister at the left rear of the engine.

  3. Object Number: 43560  Size: SH
  4. Install the left engine sight cover.