Diesel heater – fuel return Yes/No?

Moin Gemeinde. The question is in principle already in the title. Can I realize the fuel supply for a diesel stationary heating from the fuel return, or do I need a separate tank receiver/rig pipe? Would of course be stupid if I cap the return line and then the garnich goes down in the tank… Thanks schonmal Achso, Opel Vivaro 2002 1.9 DTI