There are many important systems in your BMW 335d that you want to be sure and take care of so that your car is able to run efficiently. The fuel injection system is one of them. It is what allows gasoline to be able to be sent into your manifold at the right angle. The fuel system works with your pump that helps to deliver them into the injectors. The fuel gets sprayed into the manifold and a combination of air and fuel works to allow the combustion process to take place. It's important to pay attention to the condition of your fuel injection system over time, so that you can catch problems that might arise. Worn injectors can cause your engine to misfire or you might experience rough idles. If you need OEM BMW 335d fuel injection system parts, find them here on our site.