Neon L4-2.0L SOHC (1995)
Rollover/Pressure Relief Valve: Description and Operation
Fig. 7 Fuel Filler Tube Rollover Valve
These vehicles have two rollover valves.
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One in the fuel filler tube.
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And one on the top of the fuel tank.
The valves prevent fuel flow through the fuel tank vent valve hoses should the vehicle rollover.