1991 740 I4: I bought this car for my mom and her local (small town) handy man has concluded the fuel pump(s) are out. I am curious why we have a in tank and top mounted fuel pump on this vehicle? This seems to be a very difficult service. There also seem to be several options for parts and my mom says there aren't any names stamped on either pump. 1) How do I know which pump(s) to order? 2) It seems I need a sending unit (is this the interior pump?), exterior pump and a pump housing (which I cannot find on any web site)? 3) Has anyone simply bypassed this mess and installed a engine compartment fuel pump or am I missing something? Suggestions and ideas would be greatly helpful!