Pete,
It depends on the type of fuel pump. The standard mechanical pump is a diagphragm pump, so it is less susceptible to crud in the fuel. In this situation a fuel filter between the pump and carbies will suffice.
On the other hand, if you have an electric fuel pump, such as a Carter rotary pump, then you will need to install a high quality filter between the fuel tank and the pump so as to stop and crud in the fuel eroding the rotor.
Cheers,
Peter