chamber 42 the outlet 62 is surrounded by lower sheath 66 the upper sheath 64 is welded to the multi creased chamber wall 30 and the intake 58 is in tight communication to the upper sheath 64 the lower sheath 66 is welded to the multi creased wall 30 and the outlet 62 is sealed to the lower sheath 66 which seals the chamber 42 so it can withstand a pressure differential between the inside and outside of the chamber 42 a flexible hose 68 is connected to the outlet 62 and extends to fuel inlet 70 which is connected to fuel tank 72 which is supported above the v shaped bottom wall 22 by tank supports 74 the location of the fuel tank 72 can be anywhere in the central portion of the hull using the flexible hose 68 allows the tank to be positioned in the rear of the boat because generally the fuel tank is in the stern location of the boat it is desirable to place the fuel intake system 54 in the central to front portion of the chambered boat hull 20 this provides convenient refueling especially when the boat is loaded in the aft portion of the chambered boat haul and the fuel in the fuel tank 72 builds hydrostatic pressure in the aft portion of the fuel tank because it is positioned lower than the forward portion of the tank allowing fuel to occupy the upper aft portion of the tank 72 fig9 shows a method of manufacturing the chambered boat hull 20 the assembly 82 comprises a plurality of stationary platforms 84 located on each platform are placement holders 86 in a manufacturing operation the multi creased wall.