Rio L4-1.5L (2001)
Fuel Filler Cap: Description and Operation
Fuel filler cap
A ratchet tightening device on the threaded fuel filler cap reduces the chances of incorrect installation, which would prevent sealing fuel vapors. After
the gasket on the fuel filler cap and the fill neck flange contact each other, the ratchet produces a loud clicking noise indicating the seal has been set
