Unless you get some dirt in the fuel tank, it probably never needs replacing.
The manual on my GV250, says to replace the "fuel filter screen" at 7000 KM.
But no instruction on how to do it.
The service manual shows a replaceable fuel filter (schedule says to replace at 6,000 KM) and shows how to remove the filter
and blow air pressure backwards through it and then re-install it. This makes sense if you have any problems,
but a new filter costs about $3 at an auto parts store, so I would replace it... but only is there were fuel delivery problems.
I hope this helps. Basically, we don't address fuel and air filters unless we suspect a problem.
If you ride on non-paved roads or use dirty gas, then the appropriate filter should be inspected much more frequently
than if you ride on clean paved streets and buy gas from a modern gas station.
Perhaps you want to add the air & fuel filters to your 2-year maintenance when you change the antifreeze and brake fluids.
scoot safely,
