A pressure vessel fluid manifold assembly comprising: a pressure vessel having a plurality of lobes joined to each other, each of the plurality of lobes having a wall disposed in contact with an adjacent wall of an adjacent lobe ; a first end and a second end of each of the plurality of lobes ; a plurality of end caps , each of the end caps mounted to the first end and the second end of the plurality of lobes ; 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 , 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 ; 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 joined to each other, each of the plurality of lobes having a wall disposed in contact with an adjacent wall of an adjacent lobe ; a first end and a second end of each of the plurality of lobes ; a plurality of end caps , each of the end caps mounted to the first end and the second end of the plurality of lobes ; 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 , 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 ; 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 ; 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 . <EOS>