Town & Country Van 2WD V6-230 3.8L VIN L SMFI (1997)
Rollover Valve: Description and Operation
Fuel Tank, Filter, And Chassis Line Routing
PURPOSE
PURPOSE
All vehicles have a combination pressure relief and rollover valve. The dual function valve relieves fuel tank pressure. The valve also prevents fuel
flow through the fuel tank vent valve hoses should the vehicle rollover.
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Prevents fuel system damage, by venting the system in the event of high internal pressure or vacuum.
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Prevents fuel and vapors from escaping into the atmosphere, (except under extreme conditions, see above).
OPERATION
Rollover Operation
Prevents fuel from escaping, (through the EVAP System), in the event of vehicle rollover, the valve will become inverted.
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All vehicles pass a 360° rollover.
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In this position the plunger is forced against the guide plate and raw fuel is prevented from flowing through the valve orifice into the vent tube.
Pressure Relief Operation
The pressure relief valve opens at a certain pressure.
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When fuel tank pressure increases above the calibrated pressure, the valve opens to release fuel tank vapors pressure.
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The charcoal filled evaporative canister stores the vapors.