Do you need a fuel pump in the 2nd tank to pump the veg oil to engine?

Hi there everyone,
I plan to do a conversion of the MB with 2 tank system. I think I got most of the main ideas straight but I just want to know if I need a pump to run the vegie oil from the 2nd tank (in trunk) to the front? Many 2tank system seems like to be gravity filled.... Anyone tried w/o the pump or with the pump?
Thanks!

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