WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The APR High Pressure Fuel Pump Upgrade (MS100076) is a critical performance component for the Audi S5 4.2L V8 FSI. Designed to support high-horsepower applications, such as supercharger systems, these pumps increase the maximum volume of fuel delivery by 41% over stock. This is achieved by increasing the internal bore diameter of the pump's pressurizing cylinder, ensuring that fuel rail pressure remains steady and reliable even at lower RPMs where factory pumps often struggle to keep up with demand.
Every APR HPFP is built using brand-new, genuine Hitachi components and is assembled in-house under surgical clean-room conditions. The internal plunger is crafted from heat-treated, bearing-grade stainless steel with a Diamond-Like Coating (DLC) to ensure ultra-low friction and extreme durability. To prevent mechanical failure, each pump is rigorously tested on a specialized rig to verify seal integrity and solenoid operation, ensuring they are fully broken-in and ready for high-performance use the moment they are installed.
Features:
- 41% Increased Displacement: Dramatically increases the volume of fuel available to the injectors to support forced induction and high-output tuning.
- Precision Machining: Manufactured to extreme tolerances (.00004" dimensional and .00005" geometrical) using medical-grade precision machinery.
- DLC Coated Piston: Features a specialized diamond-like coating for exceptional surface hardness and ultra-reliable operation against the camshaft.
- Verified Performance: Every pump is machine-tested and broken-in before shipping to eliminate the risk of out-of-the-box failures or camshaft damage.
- Upgraded Internals: Includes a weight-matched spring to prevent plunger "float" and high-grade spring seals for long-term pressure retention.
- OEM Reliability: Built using only genuine Hitachi German-made pump bodies and sensors to maintain factory-level integration.
Product Contains:
- (2) Fully Assembled and Tested APR High Pressure Fuel Pumps
Vehicle Fitment:
| Make | Model | Year Range | Engine |
|---|---|---|---|
| Audi | S5 (B8) | Pre-November 2008 | 4.2L V8 FSI |
Important Installation Note: This specific part number (MS100076) is only for vehicles produced before November 2008. Please verify your vehicle's build date before ordering. Additionally, APR recommends replacing your factory cam followers during installation to ensure the longevity of both the new pumps and your engine's camshafts.
Warranty: This product is supported by a Manufacturer's Warranty. Note: Manufacturer warranty terms are subject to change.
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