I took the tank off and put a small amount of petrol in and gave it a good shake. I then gave it a few gentle thumps, shook it some more and emptied it out through the filler neck. Repeated it a couple of times until no more rubbish came out. I then removed the sender and pick up. If I did it again I would have removed them first. I then used some rust treatment and then some tank lining liquid to seal the inside. My tank seemed in pretty good condition really.
Anonymous