How to find evap leak. If the ball floats above the calibration pointer the system is leaking. To run a motorvac evap leak test calibrate the flow meter for either a020 or040 inch leak. After the system fills check the flow meter.
The evap system also monitors the gas tank so an open gas cap can. This o ring is large and is subject to wear due to its constant removal when the tank is filled. Since the gas cap is the biggest leak an evap system can have first check to see if the cap is tight and seals against the filler neck.
How to find fix an evap leak. Refer to a repair manual to help you localize the evap leak. You can use an engine vacuum pressure gauge to check for evap leaks.
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