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If it leaks when you run the tap , then either the tap fitting or tap pipe work is at fault . If the floor seems dry i expect the water is running down the wall and out through the wheel arch . You need to access the tap pipe work and give it a thorough check as you operate the taps , try taking drawers etc out and also have a look through the fridge vents ( though i expect all you'll see is the back of the fridge ).

atb

Wizard

if water pipes are ok then the waste pipe may have come off under the sink. one test is to put 6 ltrs of water down the drain with a large jug and see how much you get out and if there are any leaks as you do it. if you do this you know it not the taps leaking.

Is this van new to you, or has this fault only just started.

I had a fleetwood van once that had a drain pipe that was directed into the wheel arch to allow the water to drain out onto the floor.

Strange I know but it may be a design feature in your van also.