Pump unit

The intermediate part (25) is fixed between the unit case body (6), which integrally houses the fuel pump (3) and the filter element (4), and the unit case supporting flange (5), which hangs the pump unit (1) from the upper wall of the fuel tank. A height (Ha) of the intermediate part (25) is set to correspond to a height difference between a height (Ht) of the fuel tank and the sum of a height (Hb) of the unit case body (6) and a height (Hc) of the unit case supporting flange (5). The wall (26) is arranged in the proximity of the lower end of the intermediate part (25) to make a fuel channel formed below the wall small and avoid generation of air stagnation in the fuel channel.