<p>A reservoir arrangement for use in an automotive fuel tank includes a reservoir body (3) in which fuel is guided and from which fuel is pumped. The reservoir body (3) defines a fuel passage (27) by upwardly depressing its bottom surface (11) and fittingly engaging the depressed surface with a chamber plate (29). The chamber plate (29) is made of a material whose swelling amount by fuel is larger than that of the reservoir body (3), thereby causing a tight fit of the chamber plate (29). <IMAGE></p>
