Fuel sender - Removal Help

[radar23]

Hi, my first post so go easy on me...

This is a simple job I thought but I can not for the life in me remove the fuel send unit fitted to the tank on my 1968 MK2 Cortina. The sender is positoned on the LHS of the tank, and it looks like it only requires rotating to remove, but it will not budge. Can someone please help as I do not want to use extreme force for this job to prevent damaging anything.

Is there something I should know?

I have a repacement send to put in, to fix my fuel guage faults, as I susspect the sender float is buggered..

Thanks in advance..

Radar