Just as I thought it would be, a broken seal on the connection between the tire valve stem and the end of the extender. Can't fix that so I put one one old extenders on that I had. Seems to be holding air.
On the subject of extenders, I would not suggest anyone using the type that do not have the internal rod to depress the tire valve stem. The one I had to put on is from my first set and does not have the rod. Had to make do with what I had. When I get back I am going to go to a truck tire shop and get long metal valve stems installed and do away with the rubber extenders. I got eight years service out of the current ones and this is the first problem. I did have problems with the ones that hold air pressure in the extenders. They both are made by Wheel Masters but I can not figure why they make the non rod type when the other works so well.
Anyway got it done, back hurts, wife keeps reminding me I have already had one back operation so be careful. Wives are good at that. One other thing, those long neck fillers at stations, most of the time would not do the job, angle interference, and that is the reason I went to extenders.