I have a MK1 skoda fabia Ambient 1.4 tdi and I've found the fuel gauge is incorrect I have a full tank but the gauge is reading wrong and displaying half a tank I went out and brought a brand new pump and sender (as they are combined) and fitted it today only to find the gauge still says half a tank. Has anyone else had this issue? I've checked the plug and cable and all are fine any help and advise would be much appreciated. 

With thanks Colin. 

You need to reflow all the solder pads on the instrument cluster circuit board.

Thanks for the fast reply Im not to bad at soldering is it a simple fix. Thanks Colin 

 

It is, just reflow all the pads where the multiplug connectors attach to the board.

Thank you so much I really appreciate your help.