Filling manifold for plural fuel tanks

In a vehicle driven by a liquid fuel-burning engine, said vehicle having a fuel tank with a filling opening, and a filling zone at the periphery of said vehicle;

• the improvement comprising an additional, separate tank having a filling opening, for additional fuel, installed on said vehicle, a filling neck for said tanks terminating in said zone, a first pipe extending from said neck to a position adjacent said filling opening of said first mentioned tank, a liquid conducting means between said position and said last mentioned filling opening, an intermediate pipe continuing said first pipe to the filling opening of said additional tank, all of the pipes, filling openings and the filling neck being in open communication and arranged for gravity filling of both tanks during a single continuous filling operation, and a vent assembly comprising a vent opening in the top of each tank, a connecting pipe connected to each vent opening, and a pipe connecting said connecting pipe to the interior of said filling neck, said vent assembly thus being in open communication with said tanks at their upper portions and with the atmosphere at the time of filling said tanks.