Fuel Fill Pipe

The fuel fill pipe on gasoline engine equipped vehicles has a built-in restrictor and deflector in order to help prevent refueling with leaded gasoline. The opening in the restrictor will only admit the smaller unleaded gas nozzle spout, which must be fully inserted to bypass the deflector. Attempted refueling with a leaded gas nozzle or failure to fully insert the unleaded gas nozzle results in gasoline splashing back out of the filler neck.