a reservoir defining a theoretical longitudinal axis, said reservoir having a peripheral side wall for segregating a limited quantity of fuel within the tank, a pair of opposing flanges disposed on the exterior of said side wall, said flanges spaced parallel from one another and extending parallel to said longitudinal axis;

a fuel pump disposed in said reservoir for forcibly moving the segregated fuel from said reservoir to an internal combustion engine;

a fuel level sender for measuring the quantity of fuel in the tank, said fuel level sender including a carrier, said carrier including longitudinally opposing side edges, each of said side edges including a channel formed therein;

a longitudinally extending sliding interface formed by said pair of opposing flanges and disposed on said side wall of said reservoir, said sliding interface having opposite ends for slidably receiving and securing said carrier along a captured alignment path defined between said ends whereby said fuel level sender can be infinitely positioned in the longitudinal direction along said sliding interface during assembly and then permanently fixed in a desired operational position for subsequent service use; and

wherein at least one upset is formed in each of said flanges spaced from said ends of said sliding interface for limiting sliding movement of said carrier there along.