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	    You mean something like this ?  Got it from 
http://www.aircraft extras .com .  I do not have a gravity system but this little gizmo has been on for over 200 hours with no problems .  Not sure if Aircraft Extras still makes them/sells it .  They may have some old stock .  I think I paid $20.00 for 2 + shipping .  Looks good and stays out of the way .  The aero engineers can jump in here , but I don't think it takes much positive pressure to "pump up the tank ?"  Sorry it is a little "fuzzy"  

  but I think you get the idea .
RB   
