I came across an interesting illustration of some calibration taking place a couple of years ago. To cut a long story shut, I lifted up the hood/bonnet and was

I came across an interesting illustration of some calibration taking place a couple of years ago. To cut a long story shut, I lifted up the hood/bonnet and was dismayed to see petrol spewing everywhere from a leak in one of the hoses supplying the inlet manifold. At this point I'd noticed that the petrol gauge was reading around an eight of a tank left. I fitted a replacement hose, and the gauge shot up to over 1/2 a tank! This happened about two years ago in a '92 BMW E36 325, and I can only guess at what the ECU was interpreting from all of this...