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 Rebuild Service (MS100073) is a precision engineering solution for the Audi 4.2L FSI V8 engine. This service transforms your existing factory pumps into high-output units capable of delivering 41% more fuel volume than stock. By increasing the displacement of the internal pressurizing cylinder, APR ensures your high-horsepower S5, RS4, or R8 remains adequately fueled, maintaining steady rail pressure even during high-load, low-RPM situations where the factory pumps often fall short.
Every rebuild is performed in-house by APR technicians in a clean-room environment. Your pumps are stripped, inspected, and rebuilt with internals machined to medical-grade tolerances as tight as .00004". Featuring DLC-coated (Diamond-Like Carbon) pistons and heat-treated stainless steel components, these rebuilt pumps offer superior surface hardness and longevity. Before being returned, every pump is validated on APR's specialized test rig to ensure perfect solenoid operation and a leak-free seal.
Service Highlights:
- 41% Volume Increase: Provides the necessary fueling headroom for supercharged or heavily tuned 4.2L FSI engines.
- Precision Rebuild: Your factory Hitachi pumps are fully disassembled, cleaned, and fitted with APR’s world-class internal components.
- Ultra-Hard Internals: Uses DLC-coated pistons and bearing-grade stainless steel to minimize friction and wear.
- Rigorous Testing: Each pump is machine-tested and broken-in on a test stand to verify solenoid health and prevent engine camshaft damage.
- Upgraded Spring & Seals: Includes weight-matched springs to prevent high-RPM "pump float" and brand-new internal spring seals.
- Retains OEM Quality: Because the service uses your original German-made Hitachi pump bodies, all factory sensors and fitment remain OEM-perfect.
Product Contains:
- (2) Full APR Internal Rebuilds for your supplied 4.2L FSI HPFPs
- (2) Machine-testing and break-in certification
How the Rebuild Process Works:
Please Note: This is a rebuild service for your existing pumps. You must send your functional factory pumps to APR's facility.
- The pump bodies and solenoids must be in good working order.
- Packaging is critical: The solenoid connectors are fragile; please wrap them securely to prevent transit damage.
- APR will visually inspect and electronically test the solenoids upon arrival.
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