MePCS^Ⓡ - Mechanical Pressure Control System

The MePCS^Ⓡ is for gas-electric hybrid vehicles, to control the internal pressure of fuel tank, and switch the isolation/connection between fuel tank and carbon canister.

The traditional solution is to use an electromagnetic valve called FTIV ( fuel tank isolation valve),  MePCS^Ⓡ is a full substitute of FTIV, and with the benefit below: