I have motored to the Scillies from Swansea a number of times, sometimes with diesel and others with petrol engines. It is a pain but the only solution that I have had, where petrol is needed, was to call into Padstow( a big diversion) with tanks that the nearest petrol garage could fill. Then you have the difficulty of how to take it to the filling station. The last time I managed to get a workman with his van to take 4 jerry cans to get filled and gave him £10 for doing so, that was lucky as taxis will not take fuel cans. Even if you can arrange it, and I think Padstow, is the best option, you are looking at a 4 hour diversion. Best wishes, I will be carrying a spare 100 litres next time, enough to get me to the Scillies and then pay a fortune at the quayside( not available Saturday afternoons or Sundays) for fuel for the return trip.
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