The fuel system is a high pressure back pressure regulated return fuel system. Brunton recommends a Walbro 255LPH inline pump. Fuel-pumps.net provides a good kit at a reasonable price.
The Fuel pump is inline with two Summit Racing fuel filters, 100 micron on the Inlet, and 10 micron on the outlet. The inlet filter is to keep any debris from destroying the $200 fuel pump. The 10 micron filter should ideally prevent the 40micron filter on the injectors from ever having to do anything.
Fitting all this hardware into the rear of this tiny car presents some interesting challenges. There is plenty of volume for the parts, but the hose can’t make the sorts of bend required to put them to the side of the tank. After some trial and error I arrived at a simple location that minimized the amount of hose needed. Time will tell whether this will be effective.