I went to open the cottage for the season. We have a jet pump mounted on a 5 gallon tank. We run a pipe with foot valve into the lake and the feed to the cottage is about 50 ft uphill. I primed the pump, turned it on and only got about a 6lb read on the gauge. I tried all kinds of things and finally got the tire gauge out and got a reading of 11 lbs. on the tank. We've never thought to check the tank pressure before because it's always worked, although the past couple of seasons we've noticed the pressure would drop too much before the pump would cycle on again. Is this all related to too little pressure in the tank?