No real reason why you cant use an aftermarket filter of the correct type however You realy dont want to be relying on the under hood filter nowadays. You realy need a proper external fuel/water separator filter something like this https://www.asap-supplies.com/produc...s-sm-18-7852-1
Modern fuel systems wont tolerate water ingress the way older two strokes would. Filtration is much more important nowadays.