Same thing happened to me on my F4i, I wasn't getting the same amount of miles on a tank that I was used to. Bike wasn't running right either, when accelerating, it would sometimes stutter and then catch.
I had taken the bike completely apart and exchanged fuel tanks. When I was putting the fuel tank on, I must have pinched the fuel line somehow cause when I unscrewed the tank and lifted it slightly, I could see the fuel line was crimped. Check your fuel line and make sure it's not crimped or obstructed in any way.
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