New to me boat. 2016 Yamaha 250 SHO. New Yamaha powerhead 25 hours ago. I was out today for the 3rd time with this motor. I was cruising around 3900 RPMs and the motor cut off like someone pulled the kill switch. I was a little dumbfounded but it cranked back up and I went around the corner and fished. Couple more short runs after that. Then the next run I was running down the lake same RPMs and the motor cut off again. Engine temp was good no alarms, but this time it wouldn’t start. It would try to crank but wouldn’t start. Got my buddy to tow me in. After searching on here I checked the fuses and they were all good. I tried pumping the bulb on the water and never could get it firm after finding it back under the transom. My optimax would firm up after a couple pumps but I don’t know about the SHOs. Battery connections are tight. Oil looked good as I just changed it. Seems like maybe a fuel problem to me but I really have no idea. Does anyone have any suggestions I can check before taking it to a shop?