Something Hanging From Ka

[martinsirl]

Hi all

Apologies for the rather flaky description here but I have noticed a small leak (possibly fuel) from the engine of our circa 2007 Ford Ka. Upon closer inspection there is a lead hanging loose with some kind of electronic switch or sensor on the end. This is dangling just below the bottom of the radiator on the right-hand side of the engine. Crawling underneath the front of the car I can see that this should probably sit in a circular hole near the bottom of the block, facing forward. The hole is threaded, around 3/4" diameter and contains a small yellow, rubber membrane.

The switch/sensor has a kind of plastic 'push and twist' moulding on it but I still can't manage to secure it in the hole. For now I have pushed it in but it doesn't feel too solid.

Does anyone know what this is (in case I have to ask a garage to sort it) or how it connects. With the car on a ramp it would probably be obvious but as it stands I can only guess.

Thanks in advance!

Martin