Changed my fuel filter on Monday Straight forward job . Managed to Nick the rubber sealing ring on sensor , result fuel leak when warmed up . Ok I thought just fit a new o ring ? 10pence & it's sorted no such luck its a special o ring you cannot buy on its own now the sad part went to local dealer yes sir you have to buy a new sensor that will be £49 sir . Very expensive rubber ring . Good news No more fuel leak lesson learned take more care when fitting parts

You'll no doubt be able to buy an O-ring to fit it, but it's a question of finding the correct diameter and thickness.