Where is the fuel pump control module located in an Audi A4?
2 Answers
The fuel pump in an Audi A7 is located inside the fuel tank. You can see the fuel pump by lifting the rear seat cushion, and it can be accessed by opening the fuel tank. The function of the fuel pump is to draw gasoline from the fuel tank and deliver it through the pipelines and fuel filter to the float chamber of the carburetor. Function of the fuel pump: The main role of the fuel pump is to supply fuel to the engine. The fuel pump delivers high-pressure fuel to the fuel distribution pipe, ensuring a continuous supply of fuel to the fuel injectors. The fuel pump consists of an electric motor, a pressure limiter, and a check valve. The electric motor operates within the fuel inside the pump housing—no need to worry, as there are no ignition sources inside the housing. The fuel lubricates and cools the motor. A check valve is installed at the outlet, and the pressure limiter is located on the pressure side of the pump housing, with a passage leading back to the inlet. Symptoms of a damaged fuel pump: When the pump core is damaged, there will be no sound of the fuel pump operating when you turn the ignition key. If the pump body is damaged, due to pressure leakage, the fuel pressure cannot reach the specified value, leading to poor fuel atomization and preventing the engine from starting. Do not wait until the fuel warning light comes on before refueling, as the fuel pump relies on the fuel for cooling. When the fuel level is too low, it cannot effectively dissipate heat, which reduces the pump's lifespan.
As an Audi owner, I know the fuel pump control module is typically located under the rear seat or beneath the carpet on the right side of the trunk. In Audi A4 models, especially newer ones, this small box controls the operation of the fuel pump, ensuring smooth fuel supply to the engine. You'll need to lift the rear seat or remove the trunk floor panel, then gently peel back the carpet to see it attached above the fuel tank. I often remind friends not to disassemble it casually because the wiring connections are sensitive - damage could lead to starting issues or fuel leaks. Keeping this area dry and clean during routine maintenance is crucial, as water ingress or dust accumulation may cause control failure. If your car suddenly stalls while driving or experiences weak acceleration, this module malfunction is one of the common culprits, requiring immediate inspection and replacement by a professional technician to avoid safety risks.
