Getting fuel from the fuel tank to the engine may seem like a simple task, but that could not be further from the truth. There are a number of components involved in the process and all of them are important, but it all ends with the fuel injectors attached to your engine. When one or more injectors fail, you will notice the symptoms immediately and if you want to continue using your car for the purposes it was built for, you will need to replace them.
After the fuel is pulled from your fuel tank, it eventually winds its way through hoses and reaches the injectors. Your engine has one injector for each cylinder, and each injector will discharge the right amount of fuel according to the instructions given to it by the vehicle's computer. However, if an injector fails, it won't be able to follow the precise instructions and the wrong amount of fuel will be discharged so that the engine will no longer be running at it's best.