In some embodiments, a fuel sump system may include one or more of the following features: (a) a fuel tank, (b) a fuel sump tank in fluid communication with the fuel tank to receive fuel from the fuel tank, (c) a fuel pump having an intake positioned in the sump tank to pump fuel from the sump tank to an engine via a fuel supply line, (d) a fuel return line in fluid communication with the engine for returning fuel the fuel return line being in fluid communication with the sump tank to supply returned fuel to the sump tank, (e) a fuel pressure regulator operably coupled to the return line, and (f) a transfer pump operatively coupled to the fuel tank and the sump tank for transferring fuel from the fuel tank to the sump tank.