A submitter describes the following difficulty with a fuel level switch. “The right low fuel level system was inoperative. (I) removed the switch and found signs of arcing on the top side of the switch. (I) troubleshot further and found the PC (printed circuit) board was defective. It is not known if the switch damaged the PC board. This is not the first time we have seen a defective float switch with signs of arcing. However, it is the first time that a damaged PC board was associated with it. It was noted when the float switch is in the ‘high fuel level’ position the contact surfaces are aligned. When the switch is in the ‘low fuel level’ the contacts are (almost) completely misaligned.” (Part number for this switch is 99144272.)

Part Total Time: 2,291.0 hours.