F 150 2WD Pickup V8-351 5.8L (1986)
Bowl Vent Valve: Description and Operation
Vacuum Bowl Vent Valve and Vacuum/Thermostatic Bowl Vent Valve
The Vacuum Bowl Vent Valve and the Vacuum/Thermostatic Bowl Vent Valve are vacuum and vacuum/temperature actuated On/Off valves.
The Vacuum Bowl Vent Valve (E3TE-9G332-AA), Figure 2 and the Vacuum Thermostatic Bowl Vent Valve (E3EE-9G332-AA), Figure 1, are similar
in appearance. The valves are used in the Evaporative Emission System to control vapor flow from the carburetor bowl to the carbon canister. With
either valve, the flow path from the bowl to the canister is closed by manifold vacuum when the engine is running. The thermostatic valve also closes the
bowl-to-canister flow path when the temperature of the valve is 90°F or less (even without manifold vacuum). When the temperature of the valve is 120°
F or more the valve is open (unless closed by manifold vacuum)
