I picked up a 2009 F800GS on Saturday. The bike started right up when I looked at it, ran fine, looked great. The owner took really good care of it and seemed like a great guy. I think this is just shit luck or maybe my own doing. Bike ran fine that night when I got home. Sun morning I went to help a friend about an hour away do chain and sprockets on his bike. The bike was a little tough to start. I had to hit the starter a few times but at least it was firing every time I hit the starter. I figured maybe it was cold and i had started it up real quick the night before for someone and thought maybe that loaded it up with fuel. Ran absolutely fine on the way to my friend's house. The gas gauge said I had plenty of gas. When I got to his place I shut the bike off on my own accord. By the time we got his bike said and done it was probably about 4-5 hours later. Went to go start it and nothing. Crank, crank, crank and no firing. Screwed around with it turning it over and trying anything when finally he asked if I had gas in it. I thought I did, but can never be too sure. I was trusting the bike gauge but knew I shouldn't have been. Went and filled up a container with over 6 gallons of gas. Got back and the bike took a lot of the 6 gallons fuel. Honestly pretty sure it was damn close to empty despite indicating I had over 100 miles until empty. By this time the battery was almost dead and it cranked a few times but didn't start. Thought maybe the gas gauge was just inaccurate and the battery was too dead to start it once I got gas in it. Luckily my roommate was home and I had him jump in my car with trailer attached and come pick me up. Charged the battery up last night and gave it a go again just now. Still nothing. I have obviously been searching and searching on this issue and have come across things like tapping on the injectors. I tried tapping on the right injector. Not sure how hard I'm suppose to tap or with what. I was using a screw driver but it didn't do anything. Not sure is there a way to get at the left side injector? I also tried tapping the fuel pump which leads me to my next question. Only owning the bike a few days and riding it a few times I assume that the pump should prime when I turn the key. I'm not hearing anything. Putting my ear right up to it and not getting anything. That would lead me to believe maybe i ran out of gas and managed to fry the pump in the process? How do I check the pump before I go out and order a replacement pump?