Thanks Phil, Trip Meter seems to not be working, but the main odometer is, so 200km between fills from here on. I think your suggestion around the ignition connector may be right, It's on my list for next weekend. The big issue was that the car had only been very lightly driven for a year or two pre my purchase (like maybe 500km), so I expect that is what caused the rust in the tank. She still hasn't wiped the smile off my dial.
