D350 1 Ton Pickup 2WD V8-360 5.9L VIN 1 4-bbl (1983)
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Evaporative Check Valve: Description and Operation
CARBURETED ENGINES
All carbureted engines are equipped with rollover valve, which is designed to prevent fuel leakage if a vehicle is accidentally rolled over. The rollover
valve is mounted in the top of the fuel tank.