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.
Fuel Tank Isolation Valve (FTIV): Notes
The FTIV is mounted between the fuel tank and the EVAP canister. The FTIV is a PCM controlled solenoid that isolates the fuel tank from the rest of the EVAP system. The FTIV is a normally closed valve blocking the flow of vapors from the fuel tank to the EVAP canister. This prevents the canister from becoming saturated causing hydrocarbons (HC) to be released into the atmosphere in a situation where the engine does not run during a drive cycle. The FTIV will automatically open to relieve excess vacuum if the fuel tank vacuum reaches a maximum calibrated value.
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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.