Loyale Sedan (4 Door) 2WD F4-1781cc 1.8L SOHC (1989)
Fuel Filler Cap: Description and Operation
Fuel Filler Cap
PURPOSE
Prevents development of a vacuum in the fuel tank in event of fuel vapor line problems and as fuel level varies.
OPERATION
When vacuum develops in the tank, valve "A" opens to admit air and thus equalize tank pressure.