In some cases, this may cause your “check engine” light to come on.
Evap system monitor on a 98 f150 4.6 triton code#
If any part of this process is not working correctly, it can result in an Evaporative Emissions System (EVS) fault code being stored by your car’s computer. When the engine is next started, a purge valve opens and fresh air is drawn through the canister to push the stored vapors back into the engine where they’re burned. The canister contains activated carbon pellets that absorb the vapors like a sponge. The EVAP system captures these escaping vapors and routes them through a series of tubes and valves to a charcoal canister. That’s why your gas cap has a small valve in it that allows vapors to escape while preventing liquid fuel from leaking out. However, when the engine is off, these vapors can escape into the atmosphere. When the engine is running, these vapors are drawn into the cylinders and burned along with the air/fuel mixture. The EVAP system is responsible for capturing and recycling fuel vapor from the engine.įuel vapor is created when gasoline evaporates in the tank or carburetor. But if you’re having problems with your EVAP system, it can be helpful to understand how it works. If you’re like most people, you probably don’t know much about your car’s evaporative emissions control system (EVAP).
The system uses a series of hoses and valves to route the vapors back into the engine where they can be burned off. The purpose of the evap system is to prevent fuel vapors from escaping into the atmosphere.
This diagram shows the components of the evap system as well as the location of the various hoses and valves. The Ford Ranger evap system diagram can be found in the factory repair manual.
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