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Yep, pretty cool!!!
The transmitter should be fine without a regulator. There is a possibility that you will wear out the output transistor faster, so it would be a good idea to have the TX checked out every year or so. It wouldn't hurt anything to add a regulator, but it wouldn't be required.
We are 99% sure that the JR fuel filters are fine to use with gasoline, but we haven't done much testing to know for certain.