I have stalled twice in the past week... once on the interstate. I am riding my Kymco P250 with just about 35,000 km on it. Carbureted engine. I thought it might be low gas and a faulty tank sensor but it was not. I filled the tank with the amount expected based on the needle position. I tried to start and the battery started getting low. It would run the starter quickly would and try to kick over but would not start (felt like it was out of gas but I had just filled up). I got tow to the dealer and they looked it over and found no glaring problems. It did start under its own power without any external additional support. It was just stubborn to start. I ride it home, even made one stop without stalls or issues. I kept it below 50 MPH the whole ride home and was very mellow. This past week ( within 3 days of the previous event) I was commuting to work and i was coming home. I had just finished a stretch of about a mile of 55 MPH and I had rolled off the accelerator and was coasting towards the traffic light in moderate traffic.. I felt the bike lug and felt it wanted to stall. I made a right turn to get off the 3 lane (each-way) expressway and was going to parallel i the smaller roads to avoid the traffic dense areas in case I had another full stall. In the end, the stall eneded and I was able to continue home. Is it possible these two events were related? Would coasting (riding with the accelerator in the full neutral position, without acceleration and without any braking) it is possible that I am seeing the first stages of a failing fuel pump failure? The coasting could prevent a vacuum from pulling the fuel up from the tank. Riding under power will draw enough vacuum but coasting under may not draw the fuel required to support combustion. I wondered if at the gas station, I was not able to create enough of a vacuum on the gas lines to support combustion. Any ideas out there?