Hi Kris, I never saw an air tank so that is a possibility...I never imagined a fully PnP plane would not have an air tank, and if so, that the owner would not be informed of that. I will check and advise. There is likely an air tank though as when I pump air into the actual fill valve in the engine management area under the hatch, the gauge rises and it holds air. I suppose it could be the gear acting as a reservoir though It does not fill as fast as it should were that the case. However; if that extra airline was for a tank I’d expect it to vent when I fill the installed air valve... seems a mystery at this point and without a complete disassembly I doubt there is an answer. I will take it all apart when I have a few free days in a row together and investigate.
Thanks again,
Len