EVAP Canister Inspection

Tools Required

• J 23738-A  Hand Vacuum Pump. See Special Tools .
• J 41413-300  EVAP Cap and Plug Kit. See Special Tools .

Fig 1: Inspecting EVAP Canister
Courtesy of GENERAL MOTORS CORP.
1. Remove the evaporative emission (EVAP) canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
2. Visually inspect the EVAP canister, especially at the arrows, for any cracks or damage.
Fig 2: Blowing Air Into ORVR Vent Port
Courtesy of GENERAL MOTORS CORP.
CAUTION: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.
3. Use the J 41413-300  or an equivalent in order to block the purge port (2) closed. See Special Tools .
4. Blow air with a pressure of 1.7 kPa (0.5 in Hg/0.25 psi) into the ORVR vent port (1).
5. Verify that air flows out of inlet air port (3).
Fig 3: Blocking ORVR Vent Port
Courtesy of GENERAL MOTORS CORP.
6. Block the on-board refueling vapor recovery (ORVR) vent port (3) closed.
7. Connect the J 23738-A  or an equivalent to the purge port (1). See Special Tools .
8. Apply a vacuum of 0.85 kPa (0.25 in Hg/0.18 psi) into the purge port (1).
9. Verify that air is drawn into the air inlet port (2).
Fig 4: Blocking The Air Inlet Port
Courtesy of GENERAL MOTORS CORP.
10. Block the air inlet port (4) closed.
11. Block the purge port (3) closed.
12. Remove the small vacuum hose between the fill limiter vent valve (FLVV) port (1) and the EVAP vacuum leak pump port (2).
13. Block the vacuum leak pump port (2) closed.
14. Apply a pressure of 19.6 kPa (5.8 in Hg/2.81 psi) to the ORVR vent port (5).
15. Verify that the pressure holds and does not leak out the small vacuum port (1).
16. Replace the EVAP canister and EVAP vacuum leak pump if any of the inspections or tests are failed. Refer to Evaporative Emission (EVAP) Canister Replacement .