Hi. So I set up a DIY system in the back of my van. Shurflo 100 PSI pump and williamson pump controller. All equipment was second hand and the pump looked battered, but worked. It all worked fine for months (about 5) then the pump started doing some funny stuff, losing pressure, inconsistent pressure etc. Also it leaked in my van one night. Then one day turned it on and nothing, no water came out. Pump was running, but sounded lumpy, and could control it through the controller to turn it up and down but nothing came out. So after playing around with it decided the pump was knackered. I bought a brand new pump, Shurflo 100 PSI, and installed it today. Turned it on and nothing? The controller seems to be working fine, you can hear the pump going up and down through the levels, sounds much better than the old one. Its purring, but no water is coming out of it? Very confused. Any ideas??