Kirk,
I will share what I PM'd you in this forum. I am just a casual observer to this thread, and have no first hand knowledge of this year truck.
The picture of the fuse block does indeed have a tab marked "fuel gauge" on it. It is adjacent to a tab marked "dome".
A picture of the interior connections of the block is included, and it appears that the above mentioned tabs and connected internally.
If the tab for the "fuel gauge" actually means sending unit, and the wire that attaches here actually goes to the sending unit, I would surmise this is actually a connection for a ground.
These two tabs are not fused. Whether Detroit would put ground connections in a "hot" fuse block, I don't know.
I am pretty sure that a non-fused, 12 volt power wire, capable of full current carrying capacity would never be attached to the sending unit.
This is an interesting question, but I just don't see why GM would have changed the way the fuel gauge/sending unit setup worked.
A simple test with a meter would answer a whole bunch of questions.
Stranger things have happened...it will all be revealed.
Stuart
