Mine failed at 10,400 ft up a mountain pass (2100 miles on the clock), luckily I had an almost 10 mile 1 in 4 downward slope to a lovely cafe where I could get a lovely cuppa whilst waiting for the tow.
Tool Wise: A sharp knife preferably a scalpel type, small possidrive screw driver, something like a hole punch and hammer to remove the screw ring, rag to clean the area before removing (stop dirt getting into tank), printed copy of replacing instructions along with normal M3W tools and a big smile.
Thank Bruce :-)