the exterior surface 22 of the top 24 of the fuel tank 12 2 a high pressure pump assembly 26 resting on the interior surface 28 of the bottom 30 of the fuel tank 12 and 3 a support column 32 connecting the motor assembly 20 to the pump assembly 26 with reference to fig2 4 the motor assembly 20 includes a motor 34 including integral electronics not shown the motor 34 is mounted to the exterior surface 22 at the top 24 of the fuel tank 12 via a mounting plate 38 preferably the motor 34 is a 12 volt dc motor receiving power from the vehicle electrical system and has a power rating which is closely matched to the operating requirements of the engine 14 the motor shaft 40 of the electric motor 34 is sealed by a small low friction radial seal not shown to prevent fuel vapors from escaping from the tank 12 the pump assembly 26 includes an upper fine filter sub assembly 42 a lower coarse filter sub assembly 44 and a pump sub assembly 46 disposed intermediate the filter sub assemblies 42 44 the pump sub assembly 46 includes a pump body 48 having a drive bore 50 formed therein which includes upper and lower drive shaft portions 52 54 and an intermediate portion 56 in which an eccentric drive member 58 is rotatable at least one and preferably multiple equi angularly spaced plunger bores 60 extend radially from the intermediate portion 56 of the drive bore 50 a pumping plunger 62 is situated in each plunger bore 60 for reciprocal radial movement therein as a result of the eccentric rotation of the drive member 58 a pumping chamber 64 is formed at the radially outer end of each plunger bore 60 as.