ok...been dealing with a stalling issue while driving. I have dual tanks on the van and the hose rounting goes like this: fuel hoses from tanks to mechanical selector valve to fuel filter to external (high) fuel pump and off to the inecjtors. The picture attached shows that the external pump comes after the mechanical selector and THEN the fuel filter. Is this correct?

 

Looks good to me. There must be some reason why you are asking if it is correct. Do you mind telling us why?
I think I might know, if I remember correctly the filter assy was mounted before the hi press pump. Is this what you found?