More than likely
The top screws off and there is a basket on the inside that can be pulled out and cleaned. If it looks like the knobs screw out and they are stuck, try putting a little penetrating oil, WD 40 or something like that and let them set for a while. Possibly, the whole top unscrews and the knobs are just there to get a grip on. Those things are not supposed to be screwed down that tight.What type of fuel filter do you have, cannister or cartridge?