I would read the following article before buying anything other than a Genuine Rotax UL Fuel Pump. the Drain hole on the brass elbow is vital. I had a lucky escape, in that the problem was found on the ground during a run up. The pump that was fitted was a non-UL type was fitted. It did not have a brass elbow with the drain hole on the impulse line to the pump. fluid drained to the pump and the hydraulic pressure ruptured the diaphragm. The diaphragm also was not the clear type found in the UL type pumps, but a fabric type which had been coated in resin. As a result of the rupture the engine ran very rough and would not develop full power.
I have seen articles where people have bought the snowmobile pump, drilled a 1/64" hole in the impulse line elbow and changed the gaskets and diaphragm to the UL type. Personally I would purchase the UL type pump in the US, but be sure it is the UL type you are buying (with the drain hole and clear diaphragm). The article below is very detailed in its explanation of the pumps.
I have also bought the bing kits from the Aircraft Spruce, but I was nabbed by customs and had to pay duty, even so, they were cheaper than Skydrive.
http://www.800-airwolf.com/pdffiles/ART ... t%2053.PDF
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