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A quick update on this - am booked in to my local RR indy in a few weeks to look at the sensors/senders. He, like a number of you, thinks that the issue is likely to be a failure at that end causing issues with the "averaging"/calibration of the fuel level, so the gauge is just giving a duff...

A further update (as I know us folks on forums love to follow a thread though to conclusion). The gauge is definitely working - the more I've driven the car lately, the needle is definitely dropping. It has moved from 1/8 below half (where it was maxing out when filled with fuel) to 2/8 below...

A quick update - now pretty sure this is fuel gauge related - did a one hour round trip on Saturday and the needle hasn't moved. So I guess investigations now move to either the physical parts of that system - stuck float/s - or the electrical parts - dodgy connections??

Shows just under half full when I can't get any more fuel in. Don't know what it shows a couple of hundred miles later - I've been working on it being a breather issue - have only been doing local trips and then repeatedly trying to top it up! I have a 140m round trip to do Friday/Saturday so...

Thanks - fuel gauge has definitely shown 100% during my ownership, and it hasn't had the battery disconnected since then

There must be a breather active when filling though? You can't have diesel going down the filler pipe and the displaced gases coming back up it at the same time - not at the rate that pumps dispense the diesel surely??

Good point. I think next step is to run it for a few more miles to see if the gauge is definitely moving. I have trip on Friday which will do just that.

Good question! I'm going by usage/fuel gauge - but I get your (inferred) point that it might be the gauge. Any easy way of identifying whether that is the cause?

I have a 2009 L322 3.6 TDV8. I can't currently fill it with diesel beyond just under half full - the back pressure causes the pump to cut out and if I try and fill very slowly I actually get fuel coming back up the filler pipe and spilling out. I suspect a blocked breather pipe is causing this...