Videos show several broken down cars and vans on the forecourt, on a nearby roundabout, and on the road from the Tesco to the nearby M32.
Intial reports suggested the diesel and petrol tanks had been mixed up – but Tesco have now confirmed the issue was down to water in the tank.
Taking to social media, one driver said: “Don’t fill up from Tesco. They have mixed up petrol with diesel at the pump. They’ve put the wrong fuel in the pumps.
“Four cars are broken down, God knows how many there are more.”
Accordong to the story reported by Daily Star, Tesco confirmed they do not believe this issue is impacting any other filling stations aside from the one in Eastville.
The motorist added: “Four cars are broken down, God knows how many there are more.
“Some of the cars have broken down on the motorway, some on the roundabouts – chaos.”
Video also shared on Twitter as a crowd of people gathered on the forecourt with their stricken vehicles.
Engineers are now on the scene and the Tesco petrol station is now closed while the issue is resolved.