The big screw-on fuel filter idea is a good one, although it only catches the contaminants between the tank and the transom (which can be considerable).

Past that point there are still a lot of potential issues living between the filter and the tips of your spark plugs. The idea to change out all rubber is a good one.

Carry what you’re willing to fight with - Mackay Sagebrush

Perfect is the enemy of good enough