Is this silver piece supposed to be in gas filler opening?

[rallytaff]

You can dump all the sugar you want into the tank of a car....it does nothing. BTW. Now....styrofoam peanuts. That a whole different gooey ball game. But you didn't hear it from me.

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When I was a cop in the UK many moons ago, I had a 1952 Ford Prefect (look it up) and someone was very jealous at the Training School and decided to put sugar in my gas tank. It did affect the running but I managed to get it cleaned and running properly again.