BROTHERS aluminum fuel tank is a popular conversion of mounting the fuel tank under the bed. Designed with ease of installation in mind, tank mounts without the need to remove your rear frame crossmember (like many other conversions). The special mounting brackets make installing and removing the tank effortless. This is the side fill tank that will require installing a filler somewhere on the vehicle, above the top level of the tank. Brothers has seen some really great ideas on this. In the fender well, through a bedside, molded in to fender, etc. Tank holds approximately 20 gallons. Sending unit sold separately.