x2 on the goo. When I first got mine, I couldn't get any liquid out of the drain. You might try a toothpick up the drain hole (with the valve open) to see if inspires the drain to pee.Check the passage behind the filter area when you change the filter. I was getting the message with no water coming out when I drained and it ended up being a white goo in the passage that was water and scum. It took 15 minutes or so to clean it out and still not sure I got it all. I am not talking about anything actually behind the filter but a passage to the left of the filter if you could look at it straight on. from the back of the truck.