C 20 3/4 Ton Pickup 2WD V8-350 5.7L VIN L 4-bbl (1983)
Rollover Valve: Testing and Inspection
Attach a short length of vacuum hose to valve inlet tube (fuel tank line connection) and blow into hose. The valve diaphragm should open and allow
air to pass through valve. If not, replace valve assembly.
