I thought a fuel filter between the pump and carby was a no no. They are meant to be on the suction side of the pump.

Those little mud wasps are mongrels for filling every little hole with mud! I have had them fill carby vent hoses on my bikes and then spent hours trying to work out why they wont go grrrr.

If its a quadrajet there will be a filter in the inlet of the carb anyway.