Fuel Pump Audi A4 993762080: The Complete Guide to Symptoms, Diagnosis, and Replacement
If you own an Audi A4 and are searching for the fuel pump part number 993762080, here is what you need to know: this part number corresponds to the in-tank low-pressure fuel pump assembly used on several Audi A4 generations, particularly the B6 (2002–2005) and B7 (2005.5–2008) models. A failing fuel pump will cause symptoms like engine stalling, difficulty starting, loss of power during acceleration, and a whining noise coming from the fuel tank area . Replacing a faulty fuel pump yourself is possible if you have intermediate to advanced mechanical skills, but it requires careful preparation, the right tools, and strict safety precautions. The cost of a DIY replacement ranges from $200 to $500 for parts alone, while professional shop labor can push the total to $1,300–$2,000 depending on the model year .
Why Your Audi A4's Fuel Pump Fails
The fuel pump in your Audi A4 is located inside the fuel tank . This electric pump works hard every time you drive, pushing fuel from the tank to the engine at the correct pressure. Over time, several factors cause it to wear out:
1. Normal wear and tear. The pump has internal components that simply wear out after years of use. Most fuel pumps last between 100,000 and 150,000 miles, but this varies based on driving conditions and maintenance habits.
2. Running on low fuel frequently. The fuel in your tank helps cool and lubricate the fuel pump . When you consistently run your tank below a quarter full, the pump runs hotter and wears faster. This is one of the most common causes of premature pump failure.
3. A clogged fuel filter. If the fuel filter becomes blocked, the pump has to work harder to push fuel through. This extra strain can cause the pump to fail sooner. Regular fuel filter replacement is a simple maintenance step that protects your pump .
4. Electrical issues. Problems with the fuel pump relay, wiring, or fuse can cause the pump to receive inconsistent power, leading to failure. The fuel pump fuse is located in position 28 in the fuse box on the left side of the instrument panel .
Common Symptoms of a Failing Fuel Pump
If your Audi A4 is experiencing any of the following issues, the fuel pump may be the culprit:
Engine stalling or sputtering. The car may stall unexpectedly, especially during stop-and-go traffic or when you are driving at low speeds. This happens because the pump cannot maintain consistent fuel pressure .
Difficulty starting the engine. You may need to crank the engine longer than usual before it fires up. In severe cases, the engine may not start at all because the pump is not delivering enough fuel pressure .
Loss of power during acceleration. When you press the gas pedal, the car feels sluggish or hesitates, particularly when climbing hills or merging onto highways. This is a classic sign of low fuel pressure .
Whining noise from the fuel tank. A healthy fuel pump makes a quiet humming sound. If you hear a loud whining or buzzing noise coming from the rear of the car near the fuel tank, the pump bearings are likely worn out .
Decreased fuel efficiency. If you notice you are filling up more often than usual, a failing pump may be causing the engine to run inefficiently.
Check Engine Light. Diagnostic trouble codes related to fuel pressure issues include P0087, P0088, P0190, P0191, P0192, and P0193 .
How to Diagnose the Problem Before Replacing Anything
Before you order a new fuel pump, you should confirm that the pump is actually the problem. Here is a simple diagnostic process:
Step 1: Check the fuse. Locate the fuel pump fuse (position 28 in the fuse box on the left side of the instrument panel) and inspect it. If the fuse is blown, replace it and see if the pump starts working .
Step 2: Listen for the pump. Have a helper turn the ignition key to the ON position (but do not start the engine). Listen near the rear of the car, at the level of the fuel tank. You should hear the pump run for a few seconds. If you hear nothing, the pump is not receiving power or has failed .
Step 3: Check for fuel pressure. If you have a fuel pressure gauge, connect it to the service port on the fuel rail. With the ignition on, you should see pressure. If you do not have a gauge, you can disconnect the return line and place it in a container while a helper cranks the engine. Fuel should flow out. If it does not, the pump is likely bad .
Step 4: Check voltage at the pump. If you have a multimeter, you can access the fuel pump connector under the rear seat or in the trunk. Connect the multimeter to the outer contacts (pins 1 and 4) and have a helper crank the engine. You should see battery voltage. If you have voltage but no pump noise, the pump itself is dead .
Replacement Cost: What You Can Expect to Pay
The cost of replacing the fuel pump in an Audi A4 varies significantly based on the model year, whether you do the work yourself, and where you buy the parts.
DIY replacement cost. If you do the job yourself, expect to pay between $200 and $500 for a new fuel pump assembly and a new fuel filter. An OEM or compatible replacement pump assembly typically costs between $65 and $100 for many models, while a complete high-quality aftermarket assembly can be $150–$250 .
Professional shop cost. If you take your car to a shop, the total cost including parts and labor ranges from $590 to $1,279 in the UK, and from $1,326 to $2,520 in the US, depending on the model year and the shop's labor rates . For example, a 2004 Audi A4 fuel pump replacement at a shop costs between $1,326 and $1,481 . Later models like the 2010 A4 cost between $2,068 and $2,520 .
Why the cost varies. The wide price range reflects differences in: the specific model year and engine type, whether you use OEM or aftermarket parts, the labor rate at the shop, and whether additional work like replacing the fuel filter or cleaning the tank is needed.
Step-by-Step DIY Replacement Guide
If you have mechanical experience and the right tools, you can replace the fuel pump yourself. Here is a general guide that applies to most Audi A4 models from the B6 and B7 generations. Always consult your vehicle's specific repair manual for your exact model year.
Tools and materials you will need:
- New fuel pump assembly (compatible with your model year)
- New fuel filter
- Socket wrench set
- Torque wrench
- Audi tool #3217 (for removing the large locking ring) or a large screwdriver and hammer
- Audi tool #3307 (for removing the pump) or needle-nose pliers
- Fuel line disconnect tool
- Jack and jack stands (if needed)
- Drain pan
- Shop rags and paper towels
- Safety glasses and gloves
- Labels for hoses
- WD-40 or penetrating oil
Step 1: Reduce the fuel level. Make sure your fuel tank is below one-quarter full. The closer to empty, the better. If the tank is too full, fuel will spill into the passenger compartment when you open the access panel .
Step 2: Relieve fuel system pressure. Remove the fuel pump relay from the fuse box (it will be labeled). Remove the fuel filler cap. Start the engine and let it idle until it runs out of fuel and stalls. Then crank the engine for a few more seconds to ensure all pressure is relieved. Turn the ignition off .
Step 3: Disconnect the battery. Use a wrench or pliers to disconnect the negative battery cable. This prevents any electrical sparks that could ignite fuel fumes .
Step 4: Access the fuel pump. On most Audi A4 models (B6, B7, and some later models), the fuel pump is accessed through the rear seat or the trunk. On B6 and B7 models, remove the rear seat cushion by pulling up on the front edge of the seat. You will then see a metal access plate secured by three Phillips head screws. Remove the screws and lift the plate . On some models, the access panel is in the trunk behind the rear seat .
Step 5: Clean the area. Use a shop vac or compressed air to clean all dirt and debris from around the pump access opening. You do not want any contamination falling into the fuel tank .
Step 6: Disconnect the electrical connector and hoses. Label the fuel lines so you can reconnect them correctly. The supply line and return line are different. Disconnect the electrical connector by pressing the release tab and pulling. Use a fuel line disconnect tool or modified needle-nose pliers to release the fuel lines .
Step 7: Remove the locking ring. The fuel pump is held in place by a large metal locking ring. Use Audi tool #3217 or a screwdriver and hammer to turn the ring counterclockwise. Before removing it, mark the position of the ring so you can reinstall it in the same spot . Once the ring is loose, lift it off.
Step 8: Remove the old fuel pump. Carefully lift the pump assembly out of the tank. Be prepared for some fuel to spill, so have rags and a drain pan ready. On some models, the top of the pump separates from the bottom as you lift. This is normal. You may need to reach into the tank to disconnect two additional fuel lines from the bottom portion of the pump .
Step 9: Transfer the seal and prepare the new pump. Remove the orange rubber seal from the old pump and install it on the new pump. This seal must be reused . If your new pump has an extra port that your old pump did not have, you will need to install a blanking cap on that port .
Step 10: Install the new pump. Lower the bottom portion of the new pump assembly into the tank. Reconnect the two fuel lines inside the tank. Push them in until you feel them click into place. Then lower the top portion of the pump, making sure the metal guide rods are positioned correctly. Push the top down until it seats. Reconnect the two fuel lines on top of the pump and the electrical connector .
Step 11: Reinstall the locking ring. Place the locking ring back on and turn it clockwise to tighten. Use the torque wrench to tighten it to 50 foot-pounds if you have the specifications . Make sure the ring is properly seated.
Step 12: Test the installation. Before reinstalling the seat or trunk liner, reconnect the negative battery cable. Turn the ignition key to the ON position but do not start the engine. Listen for the fuel pump to prime. Check for any fuel leaks around the connections. If everything looks good, start the engine and let it run for a few minutes. Check again for leaks .
Step 13: Check the fuel gauge. After reinstalling everything, check your fuel gauge. If it reads lower or higher than the actual fuel level, the float arm on the new pump may be getting caught. You may need to lift the pump and adjust the float arm so it moves freely .
Step 14: Reinstall the access panel and seat. Once you are satisfied that everything is working correctly, reinstall the access plate, the rear seat cushion, and any trunk flooring.
Important Safety Precautions
Working with fuel is dangerous. Follow these safety rules:
Work in a well-ventilated area. Fuel fumes are highly flammable. Do this job in a garage with the door open or outdoors .
Disconnect the battery. This prevents any electrical spark that could ignite fuel fumes. Do this before you start working .
No smoking or open flames. Do not smoke, use a lighter, or have any ignition sources near the work area. Keep a fire extinguisher nearby.
Relieve fuel pressure before opening any connections. The fuel system is under pressure. If you open a connection without relieving pressure, fuel will spray out .
Use clean rags. Place clean cloths around any connections you open to catch fuel spills. Dispose of fuel-soaked rags properly.
Watch for fuel leaks after installation. If you see or smell gasoline after the repair, do not start or drive the car. Have it towed to a shop for inspection .
Recommended Replacement: KEMSO Fuel Pump
When it comes time to replace the fuel pump in your Audi A4 or any other vehicle, choosing a high-quality, reliable replacement part is essential. KEMSO offers a premium line of fuel pumps designed as direct OEM replacements. Each KEMSO fuel pump is built for high performance, delivering consistent fuel pressure and reliable operation. The best part is that every KEMSO fuel pump comes with a lifetime warranty, giving you complete peace of mind that your investment is protected for as long as you own your vehicle.
Whether you are replacing the fuel pump on your Audi A4, a motorcycle, a jet ski, or any other vehicle, KEMSO has a solution. Their product lineup covers a wide range of makes and models, all engineered to meet or exceed original equipment standards. You can browse their full selection and find the exact pump for your vehicle at their official website:
When to Call a Professional
While this DIY guide covers the basics, not everyone should attempt this repair. You should consider taking your car to a professional shop if:
- You do not have the special tools required (Audi tool #3217 and #3307, or suitable substitutes)
- You are not comfortable working with fuel systems
- Your vehicle has a complex fuel system that requires specialized knowledge
- You have already tried replacing the pump and the problem persists
- The diagnostic codes suggest a more complex electrical issue
A professional mechanic can properly diagnose the problem, ensure the correct parts are used, and guarantee the repair is done safely. The labor cost for a professional fuel pump replacement on an Audi A4 typically ranges from $300 to $600, depending on the shop's hourly rate and the complexity of the job .
Final Thoughts
A failing fuel pump in your Audi A4 is a serious problem that can leave you stranded. The good news is that the symptoms are easy to recognize: stalling, hard starting, loss of power, and a whining noise from the tank. If you catch the problem early and replace the pump with a quality part like those offered by KEMSO, you can restore your car's performance and reliability. For a complete selection of high-performance fuel pumps with a lifetime warranty, visit https://www.kemsoracing.com/ and find the right pump for your Audi A4 or any other vehicle.