Failing to look after your tanks and pipework properly could really land you in hot water. Not only can a fuel leak seriously damage and pollute the environment, it could end with a hefty fine. But while leaks are something forecourt operators are well aware of, experts are warning retailers to prepare for another problem - jellyfish. No, not the real variety, but something that resembles these sea creatures - and which could end up growing in your fuel tank. And it's all to do with the growing use of biofuels.

Forecourt owners need to be more proactive in their approach to their tanks and pipework to prevent problems from happening, according to Steve Watts, UK sales director at Torex Retail. "We can all be guilty of waiting for an event to happen before doing anything about it, but cleaning up after a leak can be a very expensive business," he says.

Tanks and pipework might make up the unseen part of the forecourt, but nothing is more integral to the successful operation – and safety – of the site. Tanks and pipes are governed by strict regulations, which mean retailers must keep an up-to-date written risk assessment of underground equipment and commit to maintain it.

Most forecourt retailers would think twice about ignoring a faulty pump or wetstock controls, and underground tank and pipework systems – while they might be out of sight – require the same attention to detail because neglected tanks and pipes could lead to costly clean-up bills.

BP and Total were both named and shamed as two of the most persistent polluters in 2002. All for letting fuel leak from underground tanks and pipework.