A Guide to the Fuel Pump Module Assembly for the 2013-2018 Audi S6
Learn to spot the signs of a failing fuel pump in your S6 and make an informed choice for replacement.
- Do not ignore symptoms like engine stalling, as a complete failure can occur without warning and create a serious safety hazard.
- The Fuel Pump Control Module is a separate part that fails often and causes identical symptoms; proper diagnosis is essential.
- A Check Engine Light with code P0087 (Fuel Pressure Too Low) is a strong indicator of a failing in-tank fuel pump.
- For this repair, an OE-quality aftermarket brand like Delphi offers a reliable, long-term solution without the high dealer price tag.
Understanding Fuel Pump Failure in Your S6
The fuel pump module is a critical component that works every moment the engine is running. When it starts to wear out, it can cause serious and dangerous problems. The most severe symptoms are an engine that stalls while driving or one that cranks but refuses to start, potentially leaving you stranded. Because a complete failure can happen suddenly, it is important to address the warning signs as soon as they appear.
The Fuel Pump Control Module: A Related Issue
It is important to know that your S6 has a separate Fuel Pump Control Module located on top of the fuel tank. This electronic module tells the fuel pump how fast to run. It is a very common failure point and can produce the exact same symptoms as a bad fuel pump, including a crank/no-start condition and a P025A trouble code. In some cases, the electrical connector to this module can burn, causing an open circuit. Diagnosing which part has failed—the pump or the control module—is essential before starting repairs, as the control module is much more difficult to access and replace.
Choosing the Right Aftermarket Part: OEM vs. Aftermarket
When replacing the fuel pump module, you have a choice between a new OEM (Original Equipment Manufacturer) part from an Audi dealer, a used OEM part, or a new aftermarket part. An OEM part will be the most expensive option.
For a vehicle like the S6, choosing a quality aftermarket brand is crucial. Delphi is a well-known brand that is an OE manufacturer for many automakers, including the Volkswagen Group. This means their parts are often built to the same standards and specifications as the original factory part. Choosing a reputable, OE-quality brand like Delphi provides a reliable repair without the high cost of a dealer part. Budget-friendly, lesser-known brands can be a gamble and may have higher failure rates.
Known Issues, Recalls, and Service Bulletins
While there are no recalls specifically for the in-tank fuel pump module on the 2013-2018 S6, there are related fuel system notices:
- NHTSA Campaign 20U6/L8: This recall was for 2013-2014 S6 and S7 models. It addressed a fuel line in the engine bay that could leak due to a manufacturing issue, posing a fire risk.
- Power Loss Note: If you are experiencing a sudden lack of power, be aware of Audi recall 21H7. This addresses a common problem where a blocked turbocharger oil strainer starves the turbos of oil, causing them to fail. This is a critical issue for the 4.0T engine and can be mistaken for a fuel delivery problem.
| Part Type | Price Range |
|---|---|
| New OEM (Dealer) | $984 - $1,010 |
| New Aftermarket (Delphi) | $381.89 |
| Used OEM | $80 - $150 |
| Shop Labor | $225 - $350 |
Frequently Asked Questions
Can I replace the S6 fuel pump myself?
Yes, this is a DIY-feasible job for someone with mechanical experience. The pump is accessed by removing the rear seat cushion. You will need to work safely with fuel, disconnect the battery, and may need a special lock ring tool to remove the pump from the tank, although some mechanics improvise a tool. Always ensure the tank is as empty as possible.
What is the difference between the fuel pump and the fuel pump control module?
The fuel pump is the mechanical unit inside the tank that moves fuel. The fuel pump control module is a separate electronic computer that tells the pump how fast to run based on engine demand. They often fail with identical symptoms, so proper diagnosis is key to avoiding replacement of the wrong part.
Is a loud whining from the back seat a sign of fuel pump failure?
Yes, a loud and unusual humming or whining noise coming from the fuel tank area (under the rear seat) is a classic symptom of a failing fuel pump motor. The sound is the electric motor inside the pump straining to work.
Will a bad fuel pump always trigger a Check Engine Light?
Not always, but it often will. A failing pump will typically cause low fuel pressure, which can trigger code P0087. An electrical issue with the pump or its control module circuit can trigger code P025A. However, it's possible to experience symptoms like hesitation or long crank times before the problem is severe enough to set a code.
Technical Specifications
OEM Part Numbers: 4G0919051K
This is the in-tank low-pressure fuel pump module assembly. It includes the pump, housing, and fuel level sending unit. It is distinct from the high-pressure fuel pump (HPFP) and the fuel pump control module.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Audi S6: