At around 12.20 pm, in a fuel storage depot, an employee noted that a bitumen tank being filled was overflowing. Owing to its temperature, the product outside the tank began releasing vapours and insulating materials covering the tank caught fire. The site implemented its safety devices and the internal contingency plan was put into action as a preventive measure. The emergency services were informed and the depot was partially evacuated. The firemen set up two foam monitors and prevented the fire from spreading to the other tanks located nearby. The operator began extracting the bitumen from the tank concerned. The fire was brought under control at around 1.20 pm and the internal contingency plan was lifted at 2.00 pm. The leak remained confined in the catchpit. Property damage was minor. According to the operator’s analysis, various parameters were united which led to the spillage from the tank: excess product, gauge well damaged not allowing proper flow, and the spillage went undetected. The excess product was attributed to the fact that the finished product manufacturing unit had being using less product, and thus tank contained an already large stock. The non-detection of the rising level in the tank, followed by the spillage can be attributed to: the level rule was unavailable as it had not yet been repaired (the repair operation would require that the tank be drained), incorrect operation of the very high level/vibrating blade device (not maintained, no technical file, adaptation/product measured?), 24-hour shift in the computerised stock monitoring application, no consultation of the information given by the local level gauge. The product most likely ignited because the tank was very hot, combined with the presence of pyrophoric sulfides. In terms of corrective action, the operator agreed to repair the rule, study and install a very high level detector. In terms of organisational planning, the operators were trained, for stock calculation purposes, in the application, development and implementation of a maintenance procedure with periodic verifications for managing all levels on the site. More generally speaking, the operator has organised a program to monitor the implementation of improvement actions (including corrective actions).