You will have to keep following the fuel lines until you hit the point where you no longer have fuel flow. Until then anything is just a guess. The reason I say it like that is I don't know offhand where the filter is in your fuel system. If it is the first point in the hose coming from the tank, then the hose is probably blocked.
Also, what do you mean, it cranks but won't turn over? If it cranks it's turning over. If it's not turning over it's not cranking. Were you trying to say it's cranking but not firing?
Ken