The original fuel filter is inside the fuel pump.
Its a disc of fine copper or brass mesh mounted at top of the glass bowl and in effect the petrol is sucked through the mesh by the fuel pump.
The foreign bodies fall to the bottom of the glass bowl where they can be emptied out.
I'm not sure that putting an extra filter between pump and carb is necessarily a good idea, given the potential for pressure drop through the inline filter.
May be case of try it and see although it may take some time for fuel starvation to develop as the pressure drop will be related to how clogged the filter gets
Arwyn
