I have mentioned this problem a number of times before. Tens of thousands of RV's were produced with this faulty design. If you have a pressure fill type system and no gravity fill port, you likely have the issue. As shown in the photos posted previously, the idiots attached vent hoses at the top corner allowing water to spill out when rounding a curve or have the RV leaning towards the vents.
I lost half of my water in 80 miles of curvy PA roads. The supply hose was attached up from the bottom and the pump would suck air when the water level dropped to the top of that port. First time dry camping, and I mean dry, I had about 10 gallons of usable water.
I totally modified my system to make it vent well above the water level, and moved the pickup to the drain port. I now have use of the full capacity of the tank.
DO NOT put valves on the vent hoses, forget to open them when filling or using will cause severe damage.
Because the vehicle cannot contain its load, I reported it to the NHTSB, as if anyone there gives a rats petutie. How would you like to follow one of these faulty trailers on a motorcycle and suddenly get sprayed while riding on a wet road around a curve?
