A spokesman for the supermarket giant told Somerset Live it was thought water had got into the main tanks, which in turn got into car engines.
He said those affected needed to go directly to the filling station office and present a receipt along with their details and car registration.
Read more at http://www.somersetlive.co.uk/water-contaminates-tesco-fuel-pumps-at-shepton-mallet-store-with-scores-of-motorists-breaking-down/story-29924248-detail/story.html#JiRXUJs53cqxP1rr.99