Structure for installing fuel pump in fuel tank

A structure for installing a fuel pump in a fuel tank, in which a pump case for the fuel pump is formed to include:

• a tubular portion having one end part thereof inserted into an insertion hole formed in the fuel tank;
• an end wall portion closing the one end part of the tubular portion while facing an outside of the fuel tank, and on which a plurality of protruding portions configuring a part of the fuel pump are protuberantly arranged;
• and an annular flange portion overhanging from the one end part of the tubular portion to a lateral side while being opposed to an outer surface of the fuel tank, and
• a retainer clamping the flange portion between an outer surface of the fuel tank and the retainer surrounds the protruding portions and is fastened to the fuel tank,
• wherein an interference portion is formed integrally with an inner peripheral edge of the retainer while being overhung inward in a radial direction, the interference portion being capable of interfering with any one of the protruding portions when a relative position in a peripheral direction of the retainer with respect to the flange portion is set at a non-normal position, and a non-normal surface of opposite surfaces of the retainer is faced to the flange portion.