With the proliferation of hybrid vehicles, automakers are researching technologies to improve the performance of fuel systems while meeting safety and emissions regulations. Hybrid-electric vehicles have significantly reduced the time the engine is on, which inhibits the ability to purge fuel vapor stored in the carbon canister.

Eaton’s Hybrid Fuel Tank Isolation Valve enables fuel vapor containment within the tank until the engine is available and prevents canister saturation and hydrocarbon leakage. Our Fuel Tank Isolation Valve design allows for quick tank venting, minimizing refueling ‘splash-back’ caused by high fuel tank pressures.

—Julie Tolley, general manager, Fuel Emissions and Powertrain Controls, Eaton’s Vehicle Group

The Fuel Tank Isolation Valve leverages two key Eaton technologies—solenoids and vapor management valves—into a simpler, customizable, smaller and smarter system than traditional venting systems.

An optimized solenoid design and integrated functions reduce the number of parts required, resulting in a 33% weight savings and a significant reduction in size, according to Tolley. The Fuel Tank Isolation Valve also has an available integrated pressure sensor that can be used for fuel system leak detection and purge control.

Optional temperature sensing can be added for additional system monitoring and control. In addition, it provides flexible mounting and porting options, configurable electrical connections and variable pressure and flow settings that allow the system to be customized to meet the challenging demands of any auto manufacturer’s specific hybrid packaging requirements.