No, you do not need BUDS to depressurize the fuel system. Just let it sit for a few hours and be certain you have some rags to catch any gas when you remove the fuel filter from the fuel lines.
The online operator's guide for the 2016 RT shows that the fuel filter is scheduled to be changed at the 28K service. 1330 engines prior to the 2016 MY say 19K -- for the same filter by part number. Ask BRP why the difference and they'll tell you to ask your dealer. Don't bother asking how I know.
The part number for the fuel filter assembly is 709000684, $15.99, and includes the fuel filter and two Oetiker clamps, all you need to do the job. The fuel filter alone pn is 709000100, $16.99. The assembly price is cheaper than the total price of the individual parts. If you use the Oetiker clamps you should have Oetiker clamp pliers; I recommend Knipex Tools 10 99 i220 pliers, available on Amazon,
https://www.amazon.com/Knipex-Tools-10-99-i220
You can use automotive fuel injector clamps if you choose; don't know part numbers.
The fuel filter is on the R side vertically beneath the seat. Lots lots of Tupperware removal necessary, not difficult. Doc Humphries, Roadster Renovations has video for both air and fuel fuelter changes,
https://www.roadsterrenovations.info/how-to-videos.
If you watch Shawn Smoak's video on the 1330 RT oil change,
https://www.youtube.com/watch?v=ZPeb1YqV4Gw&feature=youtu.be, you can see how to get to the air filter without having to remove the L rear side panel, very easy, just did it today.
Air filter PN is 707800483. Use a K&N CM-1314 if you choose. No other parts required.