Replacing S4 Fuel Pump Relay?

Answer The fuel pump relay on an Audi S4 is designed to control the voltage to the fuel pump. When the engine control module, or ECM, decides to turn on the fuel pump, it signals the fuel pump relay to se... Read More »

Top Q&A For: Replacing S4 Fuel Pump Relay

How to Remove Pressure From the Fuel System for Replacing the Fuel Pump?

The fuel system pressurizes fuel from the fuel tank to the engine. Fuel-injection systems meter the fuel injected for the cylinders by controlling the length of time the injectors are open. To inje... Read More »

Replacing a Fuel Pump?

All vehicles today incorporate a fuel pump located within the fuel tank. The fuel pump is cooled by fuel. The reasoning for this is simple--longevity and sound level are the main reasons. With the ... Read More »

Replacing a 240SX Fuel Pump?

The Nissan 240SX uses an electric pump located in the gas tank to move fuel to the engine. When you start the car, the pump begins to send fuel through the pressurized lines. If the fuel pump malfu... Read More »

How to Troubleshoot a Fuel Pump Relay?

If your engine gets sparks to the cylinders but doesn't seem to get any fuel, your fuel pump relay may be bad. To troubleshoot the relay itself, remove it from your vehicle and make a test setup wi... Read More »