BMW is the first manufacturer to equip all its new diesel-powered models with an Incorrect Fueling Protection System as standard equipment. The innovative system helps prevent cases of misfueling at the pump and avoid its far-reaching consequences.
A special mechanism fitted to the filler neck prevents drivers from accidentally inserting the wrong fuel filler nozzle from a gasoline pump into the filler neck of a diesel-powered car. This technology has been tried-and-tested in a variety of BMW models with diesel engines and will now be fitted to all diesel-powered BMWs, including the 335d Sedan and X5 xDrive35d on sale in the US.
Every year, German automobile associations provide technical support in more than 5000 cases of diesel misfuelling. Rectifying the consequences of incorrect fueling is not just time-consuming, but can involve major costs. Even if the driver realizes the mistake before starting the engine, emptying and cleaning the fuel tank, pipes and pump as well as changing the filter will be unavoidable.
The large number of misfueling cases illustrates how a moment of inattention can have expensive consequences. Particularly drivers who frequently use different cars from rental companies or company fleets must pay extra attention - more so, since the performance profile and acoustic insulation of modern diesels reduce the differences between diesel and gasoline-powered engines.
So BMW is helping drivers to avoid making this mistake. The Incorrect Fueling Protection System fitted to all diesel-powered BMWs is designed to allow only diesel filler nozzles to enter the filler neck. The filler neck of these models is fitted with a locking system that can only be released by a standardized diesel filler nozzle. An unleaded gasoline nozzle with its smaller diameter cannot make the same connection and access is blocked.The Incorrect Fueling Protection System is also designed for refueling under exceptional circumstances. It is still possible for the diesel-powered model to be fuelled from a spare can. Narrow recesses on the outer walls of the filler neck allow the introduction of smaller amounts of fuel. Using a container for re-fuelling requires extra care, which serves to remind the driver of ensuring they are using the correct type of fuel.