APR High Pressure Fuel Pumps for Audi B7 RS4 4.2FSI | MS100072

The APR High Pressure Fuel Pumps (HPFP) (MS100072) are the ultimate fueling solution for the Audi B7 RS4 4.2FSI engine. This critical upgrade addresses fueling limitations imposed by high-horsepower applications, such as supercharged or turbocharged systems, by dramatically increasing the maximum volume of fuel the HPFP can deliver by an impressive 41% over stock.

The APR solution focuses on increasing the pump's displacement by enlarging the bore diameter of the internal pressurizing cylinder, ensuring a high volume of fuel is available at every RPM to keep fuel pressure steady. Featuring extreme tolerances (as tight as 0.00004" dimensional and 0.00005" geometrical), a DLC coated piston, and a heat-treated bearing-grade stainless steel construction, these pumps are built in-house using genuine Hitachi components for OEM reliability. The design retains the factory pivoting head to minimize cam follower wear, making it reliable for the most demanding driving situations.

Features:

• Increased Fuel Volume: Dramatically increases the volume of fuel displaced by the HPFP by 41% over stock.

• Supports Big Power: Maintains higher fuel pressures under demanding situations, ideal for supercharger and turbocharger upgrades.

• Extreme Tolerances: Manufactured with ultra-high precision, featuring dimensional tolerances as tight as 0.00004" and geometrical tolerances as tight as 0.00005".

• Superior Construction: Features a DLC (Diamond-Like Carbon) coated piston and plunger/barrel created from heat-treated bearing-grade stainless steel.

• Optimized Internals: Includes an upgraded and weight-matched spring and retains the factory pivoting head to reduce cam follower wear and piston side loading.

• Quality Assurance: Fully rebuilt in-house, includes new OEM Hitachi factory pumps (housings/sensors), and is fully machine tested and broken in before shipping.

Product Contains:

• (2) APR High Pressure Fuel Pump Assemblies (For V8 Engine)

• (2) New OEM Hitachi Pumps (Housing/Sensors)

• (2) Upgraded and Weight Matched Springs

• (2) DLC Coated Piston and Barrel Assemblies

• (1) Set of All Internal Seals (including spring seals)

Important Note: The HPFP internals must be installed in a clean environment to prevent pump failure. This upgrade is typically paired with APR ECU software (sold separately) to maximize performance.

Warranty This product is supported by a Manufacturer's Warranty. Note: Manufacturer warranty terms are subject to change.

Installation Instructions