Civic L4-1590cc 1.6L SOHC (VTEC) (1992)
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Two-Way Valve: Description and Operation
Fuel System Components
The Two-way Valve, mounted underneath of the fuel tank, vents fuel tank vapor pressure into the charcoal canister. When fuel tank pressure exceeds
0.4 to 1.4 in. Hg. (10 to 35 mmHg) the Two-way Valve opens. Once open, the fuel tank vapors are bled off into the charcoal canister until pressure
drops below 0.4 to 1.4 in. Hg. The ECU then determines when to draw the vapors from the canister into a port on the throttle body. For a more
complete explanation of the Evaporative Emission Control System, refer to Powertrain Management/Emission Control Systems/Evaporative
Emission System.
Specifications:
Valve opens when pressure above ...................................................................................................................................................... 0.4 to 1.4 in. Hg
Valve closes when pressure below ..................................................................................................................................................... 0.4 to 1.4 in. Hg