Fuel pump assembly

A sender assembly for detecting a fluid level in a fluid tank, the sender assembly including:

• a sender housing;
• a variable resistor with a positive end and a grounded end opposite the positive end;
• a rotatable arm that has a pivot end and a revolvable end that is rotatably fixed relative to the pivot end and configured to revolve about the pivot end, wherein the rotatable arm is pivotably mounted at a position that is fixed relative to the variable resistor at the pivot end such that the revolvable end is movable relative to the sender housing;
• and
• a wiper that is rotatably fixed relative to the pivot end such that the wiper revolves about the pivot end when the rotatable arm revolves about the pivot end, wherein the wiper is engageable with the variable resistor such that revolving the wiper about the pivot end in a first rotation direction between the positive end and the grounded end progressively increases an electrical resistance, between the positive end and the grounded end, from a minimum resistance toward a maximum resistance or progressively decreases the electrical resistance from the maximum resistance toward the minimum resistance;
• wherein when the revolvable end revolves about the pivot end in the first rotation direction the wiper revolves about the pivot end in the first rotation direction;
• and
• wherein the wiper is configured to stop revolving in the first direction when the wiper reaches a first position where the electrical resistance is one of the maximum resistance or the minimum resistance, the wiper is configured to be revolvable away from the first position to a second position where the electrical resistance is the other of the maximum resistance or the minimum resistance, and the wiper is configured to be revolvable to a third position, beyond the second position away from the first position, where the wiper would be at least partially disengaged from the variable resistor.