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1. A cap-installation signal system for a filler neck, the system comprising
a handle rotatable about an axis of rotation, a closure adapted to close the filler neck, a rotary spring coupled to the handle and to the closure to cause the closure to rotate in the first direction about the axis of rotation when the closure is inserted in a nozzle-receiving passageway formed in the filler neck in response to rotation of the handle in the first direction about the axis of rotation, and a handle-rotation limit signaler including a finger coupled to the closure to rotate therewith and a lug coupled directly to the handle to rotate therewith and to intercept the finger during rotation of the handle in the first direction relative to the closure once the closure has reached a filler neck-closing position in the filler neck and ceases to rotate about the axis of rotation, and the finger and the lug cooperate to produce a discernable warning signal in response to temporary engagement of the lug and finger during rotation of the handle relative to the closure in the first direction to alert a user rotating the handle that the closure has reached the filler-neck closing position in the filler neck and ceased to rotate.
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