Guys don't forget if you are running a carburettor engine that uses the engine pulses to siphon fuel it is critical you NOT install filters that will restrict the flow of fuel, serious power head failure will be the result.
Always check the filter you use it must me rated for two stroke and pre-mix if you do.
I remove the check valve located on top of my fuel tank, and I install fuel filter separator with a plastic bowl at the bottom so I can drain the water out if any.
With this set up I am hitting my RPM'S and the primer bulb stays a little hard ..