Jayco water tank not filling

This depends on the age of the van. Only the later models have this breather arrangement. The older vans just had a hole in the top of the tank with a bit of a baffle to stop too much dust getting in. These older vans often had the tank mounted with the breather up against the floor and this blocked the breather action. The newer vans often come with badly installed tanks and this breather tube is squashed or kinked preventing it to allow the tank to be filled normally.

Also if you are trying to fill the tank too quickly you could be drowning the breather. Take the fitting off the end of the hose, push the end of the hose down the filler pipe 100-150mm and try filling the tank. If this works then build yourself a piece of hose with a fitting to join it to your hose and use that to fill the tank. If this does not work then you will have to remove the tank and check the hoses.

PeterD

"The end of the hose should fall down the side of the tank when in situ"

Not really - if the breather tube is sticking down into the tank, the tank can only be filled to the bottom of the breather. Make sure there is nothing sticking down into the tank and then you can fill it completely.

PeterD

PeterD
Should have said down the outside of the tank. ie one side of the L shaped plastic joint fits into the top centre of the tank so you can fill the tank to the top. Plastic tube fits into the other end of the L fitting and travels along the top outside of the tank and down the outside vertical section of the tank. if you do not connect the plastic tube or it is not long enough to get rid of the overflow water some tanks have 2 deep indentations on the top of them that can fill up with the overfill water (about 2 lts each).

Peter