Nothing wrong with taking fuel on board as hand luggage. He/she was just unlucky that it started leaking
You gotta be kidding????
Dangerous Goods
The law forbids you to take the following items on board an aircraft or pack them in your checked baggage.
Corrosives such as acids, alkalis, items containing mercury and wet cell batteries.
Compressed gasses – (Deeply refrigerated, flammable, non-flammable and poisonous) such as butane, propane, oxygen, liquid nitrogen, aqualung cylinders.
Explosives munitions, fireworks and flares.
Flammable liquids and solids such as lighter fuel, matches, paints, thinners and fire-lighters.
Radioactive materials brief-cases and attaché cases with installed alarm devices.
Oxidising materials such as bleaching powder, peroxides.
Poisons and infectious substances such as insecticides, weed-killers and live virus materials.
Other dangerous articles such as magnetised materials, offensive or irritating materials.
Medicines and toiletries in limited quantities which are necessary or appropriate for the passenger during the journey, such as hairsprays, perfumes and medicines containing alcohol may be carried.