Abstract: A fuel backflow-preventing device for use in a vehicle, which includes a fuel tank containing an inlet conduit, a floating device slidably disposed within the inlet conduit and operative to seal the inlet conduit, and spring means operatively associated with the floater device and biased to effect the sealing of the inlet conduit.

Abstract: The present invention provides an apparatus for preventing an outflow of a fuel formed in a fuel tank of a vehicle, the apparatus including a fuel tank disposed in the vehicle to store a fuel and having an outlet passage to evaporate a fuel vapor of the fuel to a canister, a casing disposed to protrude into the fuel tank and having a plurality of holes formed therein for absorbing the fuel vapor, a float elastically supported by a first elastic member within the casing and having a head for shutting off the outlet passage, and a check valve capable of discharging the fuel vapor within the fuel tank by opening and closing an orifice penetrating the head according to pressure within the fuel tank.

Abstract: The present invention discloses a fuel backward flow-preventing device for use in an automotive vehicle of the present invention, comprising: a fuel filler and a fuel tank; a guide member connected to an inside portion of the fuel filler and having a plurality of slits and a plurality of passages; a floater member having projections slidably combined to the slits and ascending according to a fuel volume to block the passages; and a coupling means for connecting the inside portion of the fuel filler to the guide member lengthwise.