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On your car, positive to the battery terminal and negative to a suitable ground point.

Kudos, guys. The protection device had indeed tripped. I would probably never thought of that but for this thread.

That's interesting - is the prevention device (in the filler pipe) as easy to see as it is on the Land Rover? I've had the same problem - fuel filler cutting off and taking ages to fill the last couple of times I've filled up but couldn't think why. In fact I got to £50 and gave up. I knew about the yellow prevention thing and I have the tool in the boot. In fact I've stuck some Velcro to the tool and stuck it to the side of the battery in case I ever needed it, but as I've never put the wrong nozzle in I dismissed that as being the problem - and I couldn't see anything in the filler pipe. I didn't really look very deeply, only had a glance but I'm sure there was nothing showing, but I could be wrong. It's just occurred to me that I had the filler door hinge replaced a few weeks ago, so it might be that he did something that tripped the safety device when changing the hinge. Thinking about it, the first time I had the problem would have been the first time I've filled it up since the door hinge was replaced.

Hi Petrol and diesel pumps are different diameters. The flap is deployed automatically if you put a petrol pump into the diesel filler. As others have already said it is a simple fix using the yellow plastc tool stored on the battery. When you look down the filler there should be nothing much to see. If you see a bright yellow piece of plastic with the symbol of a manual on it you need to reset it. This video is on a Land Rover Disco but it is identical

I am concerned my XF is over charging main battery, the Bosch battery I installed in April 2021 is now failing and I cannot find any accurate information regarding maximum voltage that an AGM battery should be charging at? I have a voltage display on a cigarette adapter that shows a maximum of 14.8 mostly 14.7 whilst driving. I have just installed a BM2 bluetooth monitor on both batteries and the software on my android phone that monitors them says it is charging at 14.94 and occasionally 15.01 volts and when you run the charging test on the software at the asked 2,500rpm it claims it is being over charged at 14.99volts. So who on this forum knows the correct information as the internet varies wildly on what it should be. Has anyone else tried using one of these battery monitors? Phil

Can any one help please the dreaded flap that flips on in the fuel won't disengage even using the resting tool