A central aspect of fuel management is the efficient filtration of the fuel, in order to protect the engine and its components from contamination and damage. As manufacturers increasingly pursue a strategy of identical parts or modular design, the same engine is being used in more and more regions of the world. The fuel quality varies accordingly, at times due to biocomponents in the fuel. The water content plays a role along with dirt particles. Water separation systems can pave the way for the global application of an engine while making it possible to use biodiesel.