The present invention relates to off-road vehicle and/or work vehicle that includes but not limited to backhoe loader, excavator utilizing compressed natural gas or gasoline or diesel or petroleum fuel or any combination thereof. A cabin (102) is placed on the chassis (106) of the backhoe loader (100). A first support bracket (104) is placed on the roof (114). An upper storage tank (108) is placed on the first support bracket (104). A lower storage tank (110) is attached to a second support bracket (112) that is further coupled to the chassis (106). The gas from the upper storage tank (108) and the lower storage tank (110) is goes to the engine through a common rail supply pipe (202). The gas is being filled into storage tank through the system of gas filling valve.