Cleaning mobile unit to clean the diesel fuel, tanks and water separation. The condensation which forms inside the tanks because the proliferation of bacteria which causes the deterioration of the diesel fuel and the oxidation of the tanks. This system allows washing of the tanks without having to disembark them and the purification of fuel. Complete with two flexible hoses for fuel inlet and outlet, one with a valve Ø mm.51 for the inspection holes, the otherwith a more rigid tube with Ø 20 mm for smaller accesses. Double filtering body, the first filter Water Captor of 30 micron with water absorption has the capacity of 50 lt/min, The second filter Clear Captor of 5 microns for impurities and suspended materials has the capacity of 100 lt/min. Both areequipped with a drain to empty the water and impurities. Control panel with ON-OFF switch, pressure gauge and overpressure nozzle valve.