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HOW TO DIAGNOSE EVAP LEAKS
Leaks in the EVAP system, or fuel vapor recovery system, are frequently the
cause of check engine lights. Using a diagnostic leak detector, these leaks can be
quickly diagnosed and repaired, making them profitable services for repair facilities
PRESSURE DECAY / LEAK DOWN TEST
1. Verify if a leak is currently present, test the EVAP system using the Decay or
Leak Down testing method with air only
a. To access the EVAP service port, remove the green cap
Remove Schrader valve using the provided Schrader Valve Removal Tool
(Schrader valve has left-handed threads, turn clockwise to remove)
b. Using a scan tool, close the vent solenoid to close EVAP system from
atmosphere (If vent solenoid does not close, intermittent solenoid may have
failed)
c. Input air into EVAP system until fully pressurized. When pressure gauge
reaches its maximum pressure (12-14 inches of water column), Flow Meter
will indicate leak size (if leak is present)
d. Lock out system by turning the Flow Control Knob to the fully closed position.
Observe pressure gauge for decay
e. If no leaks are present, system will hold pressure
f. If pressure decays or leaks down, leaks exist. Proceed to step 2 to find leaks
2. Push ON / OFF button to begin 5 minute vapor cycle
3. Remove the fuel cap
4. Open Flow Control Valve to input vapor into the system through adaptor
5. Replace fuel cap when dense vapor is seen exiting the filler neck
6. Continue pumping vapor into the system
7. Using the provided Inspection Light, inspect for leaks (under the hood
and tracing the route of the EVAP system on the underside of the vehicle)
8. Repair the system as needed
9. Repeat procedures in steps above until all repairs are complete and final quality
test is performed, indicating no leaks
MDSMOKELITE
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