Michele, you shouldn"t need a schematic as you can trace the fuel lines from the tank through the filters, pump, Injectors, and the return line back to the tank. I do strongly recomend you go to a farm store Tractor Supply or equvilent and but a service manual they should by around $30 to $35. I know longer farm, but still have my tractors 756D, 706D ( 310 German )and a 460D. I don"t spend much time on them because at 65 I still work 45 to 50 hrs a week, My son has been using the 706 some same engine you have, and he said all the return lines between the injectors were leaking when running so he replaced them. He said it wasn"t using as much fuel now. You should be able to see where it is leaking. Getting the filters sealed could be one place, some have spin on filters mine both have canisters.
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