how fuel resistant is alumilite clear.

hey guys I have been playing with some casting recently and had an idea to cast a piece for my carburetor on my car.  because there is a fuel level that has to be set, and doing it the "old fashioned way" it tweak it and take it apart and measure, and put it back together, and tweak it...  its frustating.  but if I could just see inside the piece in place it would be really simple.

so my thought is how resistant to gasoline(and additives?) is alumilite clear (or any of the clear resins, for that matter) i don't know if I would leave it on there long term or just use it to tune things in then switch back to the metal piece.

thanks for taking the time.