Fuel Vapor Vent Line
- Check all hoses and fuel filler cap for leaks. Disconnect fuel tank vapor hose at canister. Attach "T" fitting, manometer, and shutoff valve to hose. See Figure .
- Slowly apply air pressure to open shutoff valve until manometer indicates 15 3/4" (400 mm) water. Close shutoff valve. Remove air supply.
- Fuel tank and hoses should hold this pressure within 1" (25 mm) of water for 2 1/2 minutes. If not, repair or replace components as necessary.
- If pressure holds for 2 1/2 minutes, remove fuel filler cap. Ensure pressure drops. If not, check hoses and lines for obstructions.