F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Evaporative Emission Control Canister: Description and Operation
Typical evaporative emissions canisters are shown in the illustration. The evaporative emissions canister is normally mounted in or near the engine
compartment.
Two basic canister sizes are employed: 925 ml or 1400 ml. This refers to the volume of activated carbon contained within the evaporative emissions
canister. Activated carbon is the working part of the evaporative emissions canister. It has the unique ability to absorb (store) and purge (remove) fuel
vapors by passing fresh air through the carbon bed. It is able to do this over and over with almost no loss in ability to absorb and purge.
All sources of fuel vapor (fuel tank and purge control valve) are routed to the evaporative emissions canister for absorption of fuel vapor.
