I am having the same problem. I have checked the wiring diagram and can tell you that the fuel gauge wire is green and black. Will be performing tests this afternoon and will update later.Fuel Gauge
I have found the sender unit it has four wires, I assume the two centre ones are earths therefore the two end ones are the pump supply and the fuel gauge but which are which ?
Ok. Sorry for the delay, unfortunately I have been unwell. In short I have been through everything. Iv'e had the dashboard out and tested the wires and gauge terminals but the results were confusing and inconclusive at best. I have a spare instrument cluster that came with the car. I plugged that in and the fuel gauge dropped to exactly the same reading as the original one. So I scoured the internet for a replacement fuel pump. I found one on Ebay for £30.00 and decided to take a chance. I have just plugged it in and moved the float to the full position. I turned on the ignition and watched the fuel gauge move slowly to the full mark. Problem solved. I'm now waiting on a new seal and will swap out the pumps. Lastly I would just like to say thanks to all who have posted advice here. It has been immensely helpful.Thanks for that. I knew that the fuel gauge was damped but the test data is most useful. I have just invested in a new multimeter as I no longer trust my old one. I will retest very soon and report back. Thanks again,A.