Mechanical fuel pumps resemble diaphragms and sit on a mount outside of the fuel tanks of older vehicles. Most modern vehicles use an electronic fuel pump, which you will find in the fuel tank itself. Whereas electronic variants deliver greater performance, they are prone to more issues. This is because both the pump and the computer that your car uses to control it can malfunction. There are a few symptoms of a faulty fuel pump to look out for. If your vehicle sputters at high speed, or loses power while under stress or even just when you accelerate, these are key signs that you need to replace the pump in your car. If your car suffers from any of these symptoms, get it checked and change your fuel pump as soon as possible to avoid costly repairs. As a vital part of the fuel delivery system, buying a good quality fuel pump will help ensure that your car continues to run smoothly (and does so for longer).