Thanks for your comment Fitch.
My 2010 RTV 900 does not have an electric fuel pump. I noticed when I installed the fuel filter assembly, which came with a 10 micron filter, I had to fill the bowl with fuel before it would start and it ran rough for a while. At that time I only had, at max, 1 1/2 gallons of fuel in the tank. I noticed that it took a second or two longer to start. I then added 5 gallons of fuel using my new "Mr. Filter", and since then it starts right up. But that's all on level ground.
I was afraid to use a 2 micron filter, but there is a 30 micron available. I will be aware of the problem you experienced. It might be a good idea to "T" around this filter with a inline filter, just in case I have a problem. I usually keep my fuel tank topped off, so I will continue to do that. I normally use it around my property, but occasionally we go on some long trail rides. Our last one was about 5-6 hours long on some mountain terrain and it only used about 2 gallons of fuel.