[f5fstop]

Usually, sulfur kills the fuel sender unit. Different areas of the country have different amounts of sulfur during different times of the year; due to different requirements for fuel. Sulfur destroys the contacts on the sender unit. Usually, when it fails, the gauge will say Empty, even if the customer has just filled the vehicle. Prevents people from being stranded.

It is not just GM. My Jeep had a sender replaced at around 12-13K, and I have never had a sender replaced in a GM, but I know many who have. The fuel senders are not manufactured by GM, the supplier, supplies many car companies the same basic sender.