I had this problem with my series 1 roadster when new. I found that the plate with all the holes in pictured above rotates very freely. Only when the hinge is at 12 o'clock will the car fill properly.
That's my memory of it, I just rotated the plate using a pencil and the problem went away.
I should call it the flap, not the plate.
Nick

Last edited by nick w; 08/05/22 09:45 AM.