Normal....providing it's not continuous. Moving the petcock seems to work for me.Hi Guy's great thread this, I have replaced my stock pump with the facet and although the bike runs fine I have an intermitant clattering coming from the pump, there is no interference in operation of the bike when it is clattering but I dont know why it is doing it. It sounds as if the pump is empty? Why? the only thing that I am questioning is should the fuel filter be between the tank and pump or the pump and carb's do I need one either side of the pump? I have tried two facets and they both do the same. Does anyone elses do this. I feel i need a explanation as it makes me feel as I cant rely on it.
Quite a few threads on the noisy Facets over the years.
Noisy Facet pump