Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Evaporative Emission (EVAP) Control System Description: Notes
| Callout | Component Name |
|---|---|
| 1 | Vapor and Air |
| 2 | Air |
| 3 | Fill Limiter Vent Valve (FLVV) |
| 4 | Vapor Recirculation Line |
| 5 | Fuel Inlet Check Valve |
| 6 | Fuel Cut-Off Valve |
| 7 | Fuel Tank |
| 8 | Fuel Level Sensor |
| 9 | Fuel Tank Pressure (FTP) and Fuel Vapor Temperature Sensor |
| 10 | To PCM |
| 11 | EVAP Canister Vent Valve |
| 12 | EVAP Canister Air Filter |
| 13 | Ignition Voltage |
| 14 | Intake Manifold |
| 15 | EVAP Canister Purge Valve |
| 16 | EVAP Canister |
The evaporative emission (EVAP) control system limits fuel vapor emissions to the atmosphere. The EVAP system transfers the fuel vapor from a sealed fuel tank to an activated carbon (charcoal) storage device (EVAP canister). The EVAP canister will store the fuel vapors until the engine is able to use them.
When the engine is able to use the extra fuel vapor, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
The enhanced evaporative emission (EVAP) system is required to detect evaporative fuel system leaks as small as 0.5 mm (0.020 inch) between the fuel filler cap and the purge valve. The system can test the evaporative emission system integrity by applying a vacuum signal, ported or manifold, to the fuel tank. This will create a small vacuum that can be monitored for leaks.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.