BMW R850R Fuel Pump, Tank, Water in the Gas
My problem was a couple of cups (approx. 200 cc) of water in my tank. This was probably from condensation. I guess the previous owner stored the bike outside during the winter. The water was not creating an obvious problem until one day I dropped the bike on the right side in a parking lot. All the water ran to the right side of the tank, and the bike started having a misfire. It was confusing until I pulled off the tank.
Before getting started mark which fuel line goes to which connector on the bike. The outlet from the pump is the lowest connector. The injector is the middle, and the return to the tank is the top.
Also note the arrow on the filter. This is the direction of fuel flow.
Here is the pump/filter assembly out of the tank.
