Marco UP Series Gear Pumps. Marco UP3 UP6 UP14 Gear Pumps. Marco self-priming electric gear pumps for the transfer of liquids of varied nature, this includes the transfer of diesel fuel between tanks, refuelling of tractors and earth moving equipment, transfer of water, light weight lube oils and antifreeze. The pumping elements are made up of bronze gears which can possibly even run dry for brief periods. Equipped with in-line filter on the inlet side.