body 12 and extends upwardly a distance approximately equal to three quarters the length of that portion of fuel pump 52 extending above base 55 second concentric flange 64 disposed radially inward from the outermost concentric flange extends upwardly for approximately one half the height of the outermost concentric flange defines a pair of annular channels 66 and 68 concentric with central axis ca channel 66 is defined by flange 62 and 64 and channel 68 by flange 64 and exterior surface 70 of fuel pump 52 seated on the upper surfaces of first and second concentric cylindrical flanges 62 and 64 a cover 72 encloses annular channels 66 and 68 and surrounds exterior surface 70 of fuel pump 52 the cover is sealed against exterior surface 70 by an o ring 74 or similar sealing element disposed in an annular groove the o ring forms a fluid tight seal between the two similarly a first recessed shoulder 76 in cover 72 is sealed against the interior surface of outermost concentric flange 62 by an o ring 77 or similar sealing element a second shoulder 78 disposed radially inwardly of first recessed shoulder 76 encloses annular channel 66 and defines a vertically elongated annular area 66a cover 72 is preferably secured to main.