Ok, so I finally got the fuel dowm. Below is an image of one side getting down to 0.7L. Note the guage is almost at quarter (20) where the light comes on and the engine dies. The fuel left has dropped below your magic number of 1.5L and I found it started to be erratic. It would drop to 0.4 then back up to 0.8 then even down to 0 then up to 1.4/1.5 then back down. At this point I happened to be near a service station (that’s what we call them in Australia) and so I wasn’t going to risk it and put some fuel in. Looks like I need to get on ebay and get one of those rings..
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cheers