I have received reports of fuel systems becoming clogged with a black mouldlike substance and I have had a similar problem with my lawnmower. This looks very much like the result of increased levels of ethanol in petrol.

Chris Thomson CAE Eng Tech AMIMI has written an article detailling the problems that could arise, published in the Stag Owners' Club magazine, VCC Gazette and Vintage Motor Cycle magazine.

I would be interested to hear from anyone who has had fuel line problems and I could send a copy of the article to anyone who wants to read it.