The customer requested gas oil pumping to the daily service tanks of the emergency or normal operation power generator units. This could be done in several ways; in each case, we would assess the redundancy and safety needs and requirements in order to provide the method with a higher warranty of complying with the needs of the installation concerned, without forgetting any details that could simplify and reduce the costs of the assembly and future maintenance tasks. In this case, pumping to both circuits would be done via two twin pressure units with two alternating motor pumps. Both circuits are designed in such a manner that if one of them stops working, the fuel can be redirected manually with manual shut-off valves. The pumping flow of each pressure unit is calculated so a single unit can provide the total flow of the system.