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 Pressure Control Valve
Port 1 is connected to manifold vacuum. Port 2 is connected to fuel tank vent. Port 3 is connected to canister. When engine is running, manifold vacuum at port 1 opens passage between port 2 and 3. When engine is not running, diaphragm closes port 2 and 3. Result is fuel tank venting through restriction. See Fig 1.
NO RELATED
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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.