If you can't find something and suspect it might be in the tank, then yes, it's time to remove tank and clean. If you have the "tea-bag" inside the tank filter, now would be the time to clean/replace that also.
Better to do these things on your time in the garage as opposed to it ruining a ride(and a possible LONG walk).:smilietwocents:
Better to do these things on your time in the garage as opposed to it ruining a ride(and a possible LONG walk).:smilietwocents: