Diagnostic Aids

Use EVAP pressure/purge diagnostic cart and ultrasonic leak detector to locate a small leak. Possible causes of a small leak are:

• Fuel cap leaking.
• EVAP vent solenoid stuck open.
• EVAP vent hose loose or damaged.
• EVAP canister leaking.
• Fuel sender assembly "O" ring leaking.
• Fuel tank or filler neck leaking.

Small leak diagnostic can detect a leak as small as 0.02" (0.5 mm).