I never have done yet in any of our diesel boats, including the sailing yacht which is lifted ashore and not used all winter, and often still has hundreds of litres in the tank.
Maybe we've just been lucky, but so far not had any problems.
At the moment the RIB is out most days for an hour or two - I think is the best way to prevent any fuel issues is to burn through the fuel as quickly as possible!
__________________
|