Fuel Tank Pressure Control Valve Inspection

Reference: FUEL TANK PRESSURE CONTROL VALVE REMOVAL AND INSTALLATION 

1. Air should pass through valve smoothly from black (3) side of valve to green or orange (2) side when blown hard.
2. From green side, even when blown softly, air should come out of black side.
3. If air doesn't pass through valve in Step  2) or hard blow is required in Step 3), replace tank pressure control valve (1).
   WARNING: DO NOT SUCK air through tank pressure control valve.
   Fuel vapor inside the valve is harmful.
4. Plug green or orange nozzle and apply 26 kPa (20 cmHg) vacuum to black nozzle. Check that vacuum is held at that level (there is no leakage).

   If vacuum leaks, replace.

   Fig 1: Cross-Sectional View Of Fuel Tank Pressure Control Valve

   Courtesy of SUZUKI OF AMERICA CORP.