This paper presents a Monte Carlo analysis for electric pump-fed systems. By leveraging the tool, it is possible to determine the optimal values of the main parameters involved in the design, operation, and selection of the pressurization system, enabling an agile system design. The study is conducted for a 400 N electric pump-fed engine powered by green propellants. This process aims at identifying the optimal operational conditions towards wet mass minimization and, eventually, assess whether a system featuring green propellants and electric pump feeding can represent an environmentally friendly alternative to conventional pressure-fed systems powered by MMH and NTO, known for their high toxicity and operational costs. The results obtained confirm similar performance to the state of the art, both in wet mass and delta-v capabilities, these last ones analyzed for different mission profiles involving orbit raising and RAAN phasing. Finally, based on the results obtained, the paper highlights the key trends towards an optimum design of electric pump-fed systems.