"They have mixed diesel with petrol in the pumps. Four cars are broken down, God knows how many more."
Tesco said its preliminary investigation "has found water in the diesel at one of the storage tanks at our Bristol East Extra petrol station".
The spokesman added the Eastville petrol station remained closed while they continued to investigate the cause and apologised to customers.
Read more: https://www.bbc.com/news/uk-england-bristol-45624227