Jayco Freedom - water tank issue

You have indicated that you have checked the breathers. It sounds like a breather/vent issue to me. It would appear that the tank/s aren't completely filling.
A simple no cost exercise would be to simply pull the vent line/s off the tank/s and then try filling the tank/s again.

This must be one of the most common problems with vans. More than likely the tank vents. The lines cannot have the slightest dip or the trapped water will cause an air lock. An idea is to put fittings on the drain lines and pressure fill from the bottom.
See the Caravaners Forum for lots of discussions on Water Tank Problems

Hi Len,

I presume that the tanks have performed correctly in the past, therefore it almost certain that the breathers are blocked, possibly by the work of a mud-wasp. Such a blockage can be hard to see and is not easily cleared.

How have you checked the breathers?
Try forcing water back through them. If it does not flow freely then there is a blockage. If it is the work of a mud-wasp then this action probably will not clear the mud blockage, it will be necessary to push a wire through the breather tubing or remove it from the van entirely to clear it. Whilst the tubing is removed it should be possible to fill the tanks to confirm that there is no other problem.

Finally, if the problem is the work of a mud-wasp, protect the outer end of the breathers with insect mesh to prevent a repeat performance.

hilen s1
i agree with alan b it will most likely be mud wasp or paper wasp but to ensure they are perfectly clean remove the air vents to check and clean them before putting insect screen over them
and like suggested fill the both tanks while the vents are off
it may take a bit of time but your efforts will be rewarded with no more future problems apart from checking the insect screen mesh that you put on the vents down the track as it too can block up with rd dust/mud causing a simular problem
cheers
barry