Fuel gauge unit for a fuel tank

摘要

A fuel gauge unit for a fuel tank which, when the gauge unit is attached to the fuel tank, is fixed in its rotational angle in a simple fashion and at a low cost; and in which the fuel scale is simple, inexpensive, and easy to inspect visually. These goals are achieved in accordance with the invention by an indicator 22a which moves back and forth in a horizontal plane when a bearing 22 connected to a float 22b rotates, the position of the indicator corresponding to a fuel scale, so that the quantity of fuel in the fuel tank 1 can be determined by inspecting the gauge. On the top of the gauge unit is a protruding rectangular portion 17b with a transparent window 17a. This protruding rectangular portion 17b engages in a hole 16a in the cover plate 16 attached to the fuel tank 1. The protruding rectangular portion 17b and its hole 16a may have a rectangular or oblong surface which serves as a rotational position lock for the gauge unit.