New Yorker V6-181 2972cc 3.0L SOHC VIN 3 FI (1989)
Rollover Valve: Description and Operation
Pressure Relief/Roll Over Valve
The dual function pressure relief/rollover valve, mounted on top of the fuel tank, relieves fuel tank pressure under normal operating conditions, and
prevents fuel flow to the vapor canister through the vent hose in the event of a vehicle rollover. The valve consists of a plunger, spring, and orifice with
guide plate, and is mounted on top of the fuel tank in a normally open position. In the open position fuel vapors from the tank travel to the vapor
canister. In the event of rollover the valve becomes inverted and the plunger is forced against the guide plate, preventing raw fuel from flowing through
the valve orifice into the vent tube.
