Truma ultraflow pump connector leaking!!!

Firstly my Truma Ultraflow has two black 'O' rings on the connector itself, if they are missing then there's water everywhere.

Secondly inside under the seat, Is your drain valve set to 'drain' (Up position) therefore stopping flow from the pump and allowing pressure build up.

... Secondly inside under the seat, Is your drain valve set to 'drain' (Up position) therefore stopping flow from the pump and allowing pressure build up.

Having the drain tap set to drain won't block the pump inlet, it'll just dump the discharge from the pump straight to the ground.

Then my valve is dodgy, when I forgot to put the lever down it blew the Truma trigger off outside but has always drained internally. Perhaps I'll check mine over, perhaps it's one way only installation.

Thanks for your feedback. The drain valve is in the flat position so I think that bit is right. The connector has two black rings..I presume they are the two O rings??

Everything is working inside ie heating etc. And it is only leaking outside when we put the taps on. 

The 'O' rings may have flattened over time, I would prise them off to look at the condition of them. Maybe a hairline crack in the socket as mine takes quite a 'wiggle' to unplug even using a bit of lube, or pressure switch set to high?

As a temporary fix, you might get away with a dab of silicone grease or spray on the O rings, if that’s what you think it might be. I carry a box of assorted O rings in the van - from Aldi for about £4. 

Thanks so much. We will try to take the o rings of and lubricate them. Not sure how you change the water pressure though!

Have you pushed the connector in until it clicks into place? It needs a relatively firm push to get it to seat into place correctly especially if the 'O' rings aren't lubricated with silicone or similar.You have to pull a little trigger underneath to release it if it is the same as mine. It shouldn't pull out unless you do this. 

.... and if the trigger lock catch is broken it will either fly out or be dislodged and leak badly.

If its been disconnected from the van by the pipe and not by holding the plug in bit then the pipe inside can come loose inside the head.  It can be reassembled but often the damage has been done and a repeat leak is always possible.