Fuel regulator

You can fabricate your own: using off the shelf components as illustrated below

Make one out of a solid aluminium block, drilled & tapped, to take fuel fittings or push on hose spigots.

If you make your own, be sure to use a fuel restrictor in the return line(Rotax recommend #35) and a smaller one in the pressure sensing line. restrictor jets can be had from Mikuni https://mikunioz.com/product-category/jets/pilot-jets/?v=13b249c5dfa9

Check out DOG aviaton http://www.dogaviation.com/2016/01/ DOG refer to this component as  "fuel marshal"

This looks great!  Thank you!