I have a Avan Cruiseliner Adventure Plus fitted with dual water tanks with a single filler inlet.The equalising of water into the second tank is very slow. The filler inlet simply overflows although there is no water in the second tank. The dealer advice was to leave it for 15 minutes until the tanks level and start the process again allowing up to one hour to fill the two tanks . Not a practical solution. I think the problem has something to do with the air release hose in the second tank. Has anyone experienced this problem how did you over come the problem? Regards Berms
While I don't have an Avan, I've had similar issues with my Jayco, as have many others. Mostly the problem is the breather on the top of the tanks. It is kinked, or more likely it loops down under a chassis rail and fills with water. There doesn't need to be much obstruction for pressure to build up preventing the inflow of more water.
Try removing the overflow pipe from the top of the tanks and see how you go. If this fixes the problem then see if you can re-route the overflow with no low areas where water can accumulate.
It's not a good idea to just leave the breather open, which is why the pipe usually comes up to a gauze filter so bugs and dirt won't go in. But looping the breather down is a sin that manufacturers are still guilty of, even after years of customer complaints.
Keep in touch.
Seems like a problem a lot of vanners have. I have a hose fitted to the bottom of each tank and a snap on fitting at the side of the van, just open the tap on the tank hose to be filled and in about 3 minutes I have a full tank. Turn the tap off to stop the back flow of water and repeat for the second tank just so nice and easy.
Just be careful, if you should have a blockage, then if say the top of your tank measures 20 inches across, and 50 inches in length, and the pressure in the tank raises by 10 psi, that's 10,000 pounds that is being exerted on the seams and stress points of the tank. 20 x 50 x 10, or 10 pounds per square inch.
