I did the same but didn't want to pay mega bucks to get the tank emptied. Walked to a nearby B&Q, bought several 1 gall fuel containers and a roll of water hose and started to drain the tank of er petroil. My car then was a Citroen BX with the hydowotsit suspension and as I tried to get the petroil out it go lower and lower eventually sitting on the ground. I then had to take the fuel tank level sender out of the tank as I had by now swallowed most of the tank contents trying to syphon it out.
Eventually a couple of hours later I gave up and put a tank of proper derv in so as to dilute the petroil.
It worked and no lasting problem. A friend ran his Sherpa van on the several cons of petroil without any issues for several weeks, but with a smokey exhaust cloud behind him.
perhaps £300 would have been a better option ;-)
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