The problem with that is the internal fuse is a thermal type fuse. It opens based on temperature of an overheated coil, not the amount of current through the coil. The coil gets hot due to a higher coil current if the user opens the lid during the fill portion of the cycle. The coil gets 135vdc applied to it to pull the solenoid in but only needs 35vdc to hold it in. In early models, if the lid was opened at the wrong time, the 135vdc was applied for too long a period of time causing the coil to overheat. Adding an external fuse won't protect the coil if this happens because the fuse rating must be high enough to compensate for inrush current when voltage is first applied. You can however, replace the internal thermal fuse with one of the same rating. There are a couple different ones being used.