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fuel gauge not registering full tank?

I have a 2008 1.6l diesel hdi citroen c5 and the last time i filled the tank to the brim the fuel gauge needle did not go all the way to the top, it stuck in the position it was in before i filled the tank, any 1 got any tips on how to fix this problem????.
thanks
jp, October 2013
On modern motors electrical problems can be a nightmare,but when you have the correct computer you can activate your gauges/lights/horn/wipers etc and this checks out your ecu and the wiring to your units and narrows down the search,as for your guage on some models you can ask for empty/half/full readings and will narrow down your searches,possible cause-tank unit but that is just a guess and just guessing can work out to be very expensive.

cdc, October 2013
link Click here to see other fixes for Citroen C5.