Q: What Is the Evaporative Emission Control System and how to replace canister on Lincoln Navigator?
A: The Evaporative Emission Control System (EVAP) stores fuel vapors from the fuel tank and intake manifold in a charcoal-filled canister, and directs them into the combustion chamber during engine operation. The system includes the canister, fuel vapor management valve, fuel tank pressure sensor, fuel filler cap, fuel vapor valve, and vacuum lines. Issues with the EVAP system can cause poor idle, stalling, and fuel odor. Excess pressure in the fuel tank, fuel vapor odor, or faulty components can be diagnosed by removing the gas cap, using a diagnostic tool, or inspecting the canister, hoses, and valves. When replacing components, label and detach vacuum lines, and remove the canister by loosening the clamp bolt. Installation is the reverse of removal.