A Gaseous Fuel Storage System for a Working Machine

An off-highway machine comprising:

• a body mounted on a ground engaging structure;
• and
• a gas engine;
• an array of storage tanks for supplying gaseous fuel to the gas engine, each storage tank comprising a cylinder having a central axis, a first end and a second end, and oriented such that first end of each storage tank is provided on the same side of the array,
• wherein each first end of the storage tanks is provided with a tank valve for controlling the flow of gaseous fuel into and out of the respective cylinder,
• wherein the tank valves of the respective storage tanks are connected in series flow communication such that a first of the plurality storage tanks comprises a first tank valve inlet in flow communication with a filling nozzle inlet, and a first tank valve outlet is connected to a second tank valve inlet of an adjacent tank in the array of tanks,
• wherein the plurality of tank valves each comprise a first port and a second port, each of which being attached to a conduit for receiving or delivering gaseous fuel to or from the storage tank respectively, and
• wherein the first and second ports are bi-directional ports which comprise a bi-directional flow passage therebetween which allows gas to flow in either direction along each conduit such that each conduit is configurable as both an inlet conduit and an outlet conduit.