Looking at a few service schedules for Australian spec petrol powered Mazda's, anything with a in-tank fuel filter is due for replacement at 150,000kms. At my work we replace the entire assembly incl pump & filter ( minus the fuel level sender ).

Im not sure if Mazda means the whole assembly incl pump or swap the pump over into a new housing?

 

Yet another method to look at is actually to acquire a energy force measure