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Home >> Chevrolet >> 2009 >> TrailBlazer 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - Troubleshooting & Diagnosis >> Fuel Tank Leak Test >> System Testing

System Testing

    NOTE: If the floating indicator registers any flow after stabilizing, a leak is evident.
  1. Turn OFF the ignition. Install the J 41413-200:  EEST and the GE 41415-50:  Cap Adapter. Test for a fuel leak while the system is under pressure referring to the J 41413-210 Operation Manual.
    2. NOTE: It may be necessary to partially lower the fuel tank.
  2. Using the J 41413-200:  EEST and the J 41413-210 Operation Manual, introduce smoke into the evaporative emission (EVAP) system. Inspect for leaks in any of the following locations:
    • The fuel tank, the fill limiter vent valve, the pressure relief valve, and the grade vent valve
    • The fuel sender, the fuel sender seal, the fuel pipe, and the EVAP pipes
    • The fuel tank pressure (FTP) sensor seal
    • The fuel fill pipe and hose
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