Anti-siphon device and method for operation of an anti-siphon device

A method, comprising:

• impeding insertion of a flexible tube into a fuel tank through a filler pipe using an anti-siphon device, the fuel tank storing a liquid fuel;
• and
• permitting fuel flow through the anti-siphon device, the anti-siphon device comprising:
• a carrier body coupled to an interior surface of the filler pipe downstream of a filler port;
• and
• a plurality of cantilevered fins having radial alignment, where circumferentially adjacent cantilevered fins of the plurality of cantilevered fins around the carrier body differ in radial length, where diametrically opposed cantilevered fins of the plurality of cantilevered fins are substantially a same length, where each of the plurality of cantilevered fins is coupled to the carrier body at a first end, is unsupported at a second end, and extends from the carrier body toward a central axis of the anti-siphon device such that the second end for each of the plurality of cantilevered fins is adjacent to the central axis, where the carrier body includes a plurality of mounting clips at a first axial end, where the plurality of cantilevered fins extend axially past an edge of the carrier body at a second axial end opposite the first axial end, and where there are no fins extending through the central axis of the anti-siphon device.

A fuel delivery system in a vehicle, comprising:

• a filler pipe in fluidic communication with a fuel tank and including a filler port, the fuel tank storing a liquid fuel;
• and
• an anti-siphon device, comprising:
• a carrier body coupled to an interior surface of the filler pipe downstream of the filler port;
• and
• a plurality of cantilevered fins having radial alignment, where circumferentially adjacent cantilevered fins of the plurality of cantilevered fins around the carrier body differ in radial length, where diametrically opposed cantilevered fins of the plurality of cantilevered fins are substantially a same length, where each of the plurality of cantilevered fins is coupled to the carrier body at a first end, is unsupported at a second end, and extends from the carrier body toward a central axis of the anti-siphon device such that the second end for each of the plurality of cantilevered fins is adjacent to the central axis, where the carrier body includes a plurality of mounting clips at a first axial end, where the plurality of cantilevered fins extend axially past an edge of the carrier body at a second axial end opposite the first axial end, and where there are no fins extending through the central axis of the anti-siphon device.