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Can you suggest a device which prevents a driver putting petrol into a diesel vehicle?

Can you please supply details of the device that will prevent one from putting petrol into a diesel car? I know you have published these details before, but at the time I did not have the need for one so did not save your information.

Asked on 20 November 2010 by JN, via email

Answered by Honest John
Misfuelling prevention devices prevent petrol filler nozzles being inserted into diesel cars. Try www.dieselkeydirect (which has Thatcham approval), www.caparorightfuel.com, www.sol-ace.co.uk, www.fuelsure.com, www.nouscap.com or www.dieselkeydirect.com. Alternatively, Fuelsure at £29.95 from Halfords and from RAC patrolmen. Or buy a new Ford diesel, all of which have them as standard.
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