A pressure vessel fluid manifold assembly comprising: a pressure vessel having a plurality of lobes (25,30,35) joined to each other, each of the plurality of lobes (25,30,35) having a wall (45,50,55) disposed in contact with an adjacent wall (40,50,55) of an adjacent lobe (25,30,35); a first end and a second end of each of the plurality of lobes (25,30,35); a plurality of end caps, each of the end caps mounted to the first end and the second end of the plurality of lobes (25,30,35); and an external fluid manifold located at an exterior portion of the plurality of end caps and fluidly coupling an interior region of each of the plurality of lobes (25,30,35), the fluid manifold having a fluid fill port; characterized in that the external manifold comprises: a plurality of bosses extending from the end caps, the location of the plurality of bosses alternating between a top side and a bottom side of the end caps, the bosses each having an aperture extending therethrough and a hole fluidly coupling the aperture to the interior region of the lobes (25,30,35); and a plurality of manifold tubes coupled to the bosses and fluidly coupled to the apertures of the bosses, the plurality of manifold tubes comprising an end manifold tube extending between a boss on the top side and a boss on the bottom side, at least one top side manifold tube extending between bosses on the top side, and at least one bottom side manifold tube extending between bosses on the bottom side. a pressure vessel having a plurality of lobes (25,30,35) joined to each other, each of the plurality of lobes (25,30,35) having a wall (45,50,55) disposed in contact with an adjacent wall (40,50,55) of an adjacent lobe (25,30,35); a first end and a second end of each of the plurality of lobes (25,30,35); a plurality of end caps, each of the end caps mounted to the first end and the second end of the plurality of lobes (25,30,35); and an external fluid manifold located at an exterior portion of the plurality of end caps and fluidly coupling an interior region of each of the plurality of lobes (25,30,35), the fluid manifold having a fluid fill port; characterized in that the external manifold comprises: a plurality of bosses extending from the end caps, the location of the plurality of bosses alternating between a top side and a bottom side of the end caps, the bosses each having an aperture extending therethrough and a hole fluidly coupling the aperture to the interior region of the lobes (25,30,35); and a plurality of manifold tubes coupled to the bosses and fluidly coupled to the apertures of the bosses, the plurality of manifold tubes comprising an end manifold tube extending between a boss on the top side and a boss on the bottom side, at least one top side manifold tube extending between bosses on the top side, and at least one bottom side manifold tube extending between bosses on the bottom side. a plurality of bosses extending from the end caps, the location of the plurality of bosses alternating between a top side and a bottom side of the end caps, the bosses each having an aperture extending therethrough and a hole fluidly coupling the aperture to the interior region of the lobes (25,30,35); and a plurality of manifold tubes coupled to the bosses and fluidly coupled to the apertures of the bosses, the plurality of manifold tubes comprising an end manifold tube extending between a boss on the top side and a boss on the bottom side, at least one top side manifold tube extending between bosses on the top side, and at least one bottom side manifold tube extending between bosses on the bottom side.