Check fuel cap for leaks, replace the cap if necessary.

Block carbon canister vent hose.

Connect the test manifold to the fuel tank filler neck or OBDII EVAP port and pressurize the System.

Monitor the pressure gauge to verify the leak - use filler latch to maintain a constant pressure on the system.

Use soapy water solution, an ultrasonic or hydrocarbon detector to pinpoint the leak.