I change my inline / in-tank fuel filters on my blower, line trimmer, chainsaw etc at least once a year along with the air filter. I just changed one on my 4 stroke powerhead. Luckily the machine's fuel line came with some sort of spring-looking clamp at the end to keep it tight on the male fitting of the fuel filter. I can not find these clamps or anything similar, and it's what's keeping the fuel filter on. I checked the parts diagram for this machine. I use the high end tygon fuel line...
Fuel line clamp for mini inline trimmer fuel filters?
Fuel line clamp for mini inline trimmer fuel filters?