fig3 of the drawings there is illustrated a sectional view through a float device according to a third embodiment of the present invention for fitting within a circular aperture formed in the top wall of a fuel tank not shown the device comprises an elongate circular section of filter in the form of a metal sleeve 10 provided with an array of apertures 11 the sleeve 10 is open at its lower end and closed at its upper end by a flanged end cap 12 which is arranged for securing around its periphery to the edges of the aperture in the fuel tank a rigid feed pipe 13 extends through the end cap 12 and the lower end of the pipe 13 is connected to an elongate coiled flexible tube 14 of plastics material for example the lower end of the flexible tube 14 is connected to a fuel pick up arrangement 23 comprising a float 24 having a sealed chamber that is filled with air and a float housing 25 the housing 25 is substantially cylindrical in shape and comprises a substantially inverted frusto conical lower section 26 the lower section comprises a plurality of apertures 27 formed in the side wall thereof which serve to filter the fuel and prevent sediment and other matter from being drawn into the housing 25 an upper section of the housing 25 comprises a.