HITACHI YB51G8 Injection High Pressure Fuel Pump RS5

( Brand: Hitachi ), ( Manufacturer Part Number: YB51G8 ), ( Part Type: Pressure Fuel Pump ), ( Product Warranty: 12 Month Warranty ), ( Part Info: Direct Injection High Pressure Fuel Pump ), ( Years: 2012 2011 2013 2014 2015 12 11 13 14 15 ), ( Models: A8 Quattro Rs5 ), ( Important: Please Read All Notes Before Making This Purchase ), ( Cs-sku: 400 )

Review HITACHI Direct Injection High Pressure Fuel Pump Audi Rs5 fits QUATTRO A8 2011–2015

The **Hitachi YB51G8 Injection High-Pressure Fuel Pump** is a precision-engineered, direct-replacement component designed specifically for Audi s high-performance models from the **2011 to 2015 generations**, including the **A8 L (W139) and RS5 (W13X)**, as well as the **Quattro-equipped S5 and S6** variants. Engineered to meet the demanding requirements of Audi s **3.0L V6 TDI and 4.0L V8 TDI engines**, this fuel pump is a critical component of the **common-rail diesel injection system**, ensuring optimal fuel delivery under extreme pressure conditions. Built with **high-grade aluminum alloy** and reinforced internal components, the YB51G8 is constructed to withstand the **up to 2,000 bar (29,000 psi) of pressure** generated by the high-pressure rail, preventing fuel slippage, cavitation, and premature wear common issues in aggressive driving or high-performance applications. Its **sealed magnetic drive mechanism** eliminates the need for external wiring, reducing the risk of electrical interference and fuel contamination, while the **precision-machined ceramic or metal-ceramic plunger assembly** ensures consistent fuel metering, even under the most demanding operating conditions. This pump is fully compatible with **Audi s 2.0L TDI (EA888) and 3.0L TDI (EA897) engines**, making it a versatile upgrade for both daily drivers and enthusiasts seeking improved reliability, fuel efficiency, and performance. Whether used in stock applications or integrated into a **turbocharged or supercharged setup**, the YB51G8 delivers **superior durability and consistent fuel flow**, reducing the likelihood of clogging, fuel starvation, or the need for frequent replacements a common frustration with lower-quality aftermarket pumps. Backed by **Hitachi s reputation for automotive excellence**, this component is a trusted choice for mechanics and DIY enthusiasts alike, offering a seamless fit, extended service life, and the confidence of a brand synonymous with precision engineering.

### **Pros and Cons of Buying a Hitachi YB51G8 Injection High-Pressure Fuel Pump for 2011 2015 Audi A8 (Quattro) / RS5**

1. **Direct Replacement Fit** The YB51G8 is a direct drop-in replacement for the original Bosch or Delphi fuel pump used in the 3.0L V6 TDI (A8 Quattro) and 4.2L V8 TDI (RS5) engines in these model years. It eliminates the need for extensive modifications or wiring changes.

2. **High-Pressure Capability** Designed to meet or exceed the fuel injection pressures required by Audi s common-rail diesel systems, ensuring proper fuel delivery and performance.

3. **Reliability and Durability** Hitachi is a well-regarded brand in the aftermarket for fuel pumps, known for producing components that last longer than some OEM alternatives, especially in high-mileage or demanding applications.

4. **Compatibility with Upgrades** If you plan to modify your engine (e.g., turbo upgrades, larger injectors, or higher rail pressures), this pump can often handle increased demands better than stock OEM units, which may fail prematurely under stress.

5. **Wider Availability and Cost-Effective** Compared to OEM pumps, the YB51G8 is generally more affordable and easier to source, reducing downtime and repair costs.

6. **Reduced Risk of Fuel Starvation** Many OEM pumps in these Audi models are prone to clogging or failing due to poor fuel quality or carbon buildup. A Hitachi pump is less likely to cause misfires or drivability issues related to fuel delivery.

7. **Aftermarket Support** Hitachi pumps are commonly used in tuning communities, so troubleshooting and replacement parts are readily available if issues arise.

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1. **Potential Quality Variations** While Hitachi is a reputable brand, some units may have inconsistencies in manufacturing quality, leading to premature failure in rare cases. Always purchase from a trusted seller with return policies.

2. **Compatibility with Stock Rail Pressure** If your engine is stock (no modifications), the YB51G8 may not provide a noticeable performance advantage over the OEM pump. The benefits are more apparent in tuned or high-stress applications.

3. **Installation Complexity** Replacing the fuel pump requires draining the fuel system, removing the fuel rail, and ensuring proper sealing. While not extremely difficult, it is a labor-intensive job that may require mechanical skill or professional assistance.

4. **Risk of Contamination** If the fuel system is dirty (e.g., clogged injectors, contaminated fuel lines), a new pump may not perform optimally until the system is cleaned. This could lead to false assumptions about the pump s reliability.

5. **Cost of Associated Components** Replacing the pump often necessitates upgrading other related parts (e.g., fuel lines, injectors, or the fuel filter) to ensure the system operates efficiently. These additional costs should be factored into the decision.

6. **Limited Longevity in Extreme Conditions** While Hitachi pumps are durable, they may not outlast OEM pumps in extreme conditions (e.g., frequent short trips, poor fuel quality, or aggressive driving). Proper maintenance (e.g., fuel system flushes) is essential.

7. **Potential for Overkill in Stock Applications** For a stock A8 Quattro or RS5, the performance gain from upgrading to a Hitachi pump may be minimal unless you are experiencing fuel-related issues (e.g., misfires, poor idle, or low power).

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The **Hitachi YB51G8 fuel pump is a solid choice** for 2011 2015 Audi A8 (Quattro) and RS5 owners, particularly if you are experiencing fuel delivery problems, planning engine modifications, or want a more reliable long-term solution than the OEM pump. It offers a balance of performance, durability, and cost-effectiveness, especially in tuned applications.

However, if your vehicle is running well with the stock pump and you are not modifying the engine, the upgrade may not be immediately necessary. In such cases, the benefits are more about **preventative maintenance** and **future-proofing** rather than immediate performance gains.

- You are experiencing fuel-related issues (e.g., rough idle, misfires, or loss of power).

- You plan to modify your engine (turbo upgrades, larger injectors, or higher rail pressures).

- You want a more durable pump than the OEM unit, especially if your vehicle has high mileage or operates in harsh conditions.

- You are replacing a failed or degraded OEM pump and want a higher-quality aftermarket alternative.

- Your vehicle is running smoothly with the stock pump and you have no immediate fuel system concerns.

- You are on a tight budget and the OEM pump is still functional (though it may fail sooner).

- You are not planning any engine modifications, as the stock pump may suffice for daily driving.

**Final Note:** Always pair the pump replacement with a **fuel system flush** and **new fuel lines/filter** to ensure optimal performance. Purchase from a reputable seller (e.g., eBay, specialized diesel forums, or trusted aftermarket suppliers) to avoid counterfeit or low-quality units. If in doubt, consult with a diesel specialist or tuner familiar with Audi s TDI systems.

Details:

Audi A8 Quattro 2012 4.2L V8. Audi RS5 2013 - 2015. Audi A8 Quattro 2012 - 2013 6.3L W12. Audi A8 Quattro 2014 Naturally Aspirated.

Direct Injection High Pressure Fuel Pump.

part #: yb51g8 prices

• $279.99-$298.99

specifications carfuelinjector:

• for models: A8, Quattro
• for makes: Audi
• for years: 2011-2015
• brand: Hitachi
• mpn: Yb51g8
• part type: Pressure Fuel Pump
• product warranty: 12 Month Warranty
• part info: Direct Injection High Pressure Fuel Pump
• years: 2012 2011 2013 2014 2015 12 11 13 14 15
• models: A8 Quattro Rs5
• important: Please Read All Notes Before Making This Purchase
• cs-sku: 400

seller carfuelinjector:

• rating: 98.8%
• city: Tolleson, Arizona
• # reviews: 68776

returns carfuelinjector:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

payments carfuelinjector:

• wallet: Paypal
• credit card: Diners-club
• other

general carfuelinjector:

• condition: New
• Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors

offer carfuelinjector:

• sold: 0
• quantity: 1
• availability: In Stock
• started: June 5, 2026
• options: Ship-to-home

shipping carfuelinjector:

• type: Fixed
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• transit: 4-7 Days
• class: Standard
• carrier: FedEx

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