To test a fuel filter...one way....place a 3 foot long piece of fuel line on filter. Place filter in a cup of fuel on a table outdoors. Have the other end of fuel line about 30 inches lower. Suck on end of fuel line to start a syphon of the fuel. The fuel should flow on its own into another cup or container by it self. The rate of flow tell you how free the filter will pass fuel. If you do not want to suck on fuel line...use a primer bulb off any power device like a weedwip! Or use a fuel tank & pressize the tank with a long fuel line attached to out-let to check flow. If the Idea is not clear...find help or another hobby! Capt,[:-]