What's this widget called?

[andymc]

The thingummy behind/above the fuel cooler (i.e. the little radiator-like object behind the rear OS wheel) that has fuel lines running into and out of it ... need a replacement as it's leaking fuel steadily.

[Alan123]

I believe that is your fuel cooler but I will stand corrected :D

[clf]

I think that is the thermostat housing, but I too, will be happy to be corrected. there was a post a few months ago, about someone having a leak, and replacing it.

[andymc]

Cheers guys, pretty sure that the little "mini-radiator" is the fuel cooler itself, but the bit I've circled above that is what's leaking. Does the fuel cooler have its own thermostat then? Could be that if so ...

[Arctic]

Thermostat as above David L sorted his out not long back here is a link i am sure he will come onboard with more info for you Arctic.
http://www.the75andztclub.co.uk/forum/showthread.php?t=205133