TGK High Pressure Fuel Pump Seal Rebuild Kit For Audi 4.2L(EA824) / 6.3L (EA398)

Over time, the factory high-pressure fuel pump (HPFP) seals in Audi 4.2L EA824 and 6.3L EA398 engines degrade, leading to fuel leaks, pressure loss, and performance inconsistencies. Additionally, upgrading to larger HPFP pistons—often used in high-performance applications—can cause the OEM seal to tear, resulting in fuel seepage and oil dilution inside the motor.

The TGK Motorsport HPFP Seal Rebuild Kit is designed to fix factory leaks, replace torn seals from HPFP upgrades, and restore fuel system integrity. Whether you're performing preventative maintenance or modifying your engine for more power, this kit ensures optimal HPFP operation and long-term reliability.

Don't wait for fuel leaks to compromise your engine’s performance and reliability. Whether you're fixing a factory issue or replacing a torn seal from an HPFP upgrade, the TGK Motorsport HPFP Seal Rebuild Kit ensures leak-free, high-pressure fuel delivery for maximum performance and longevity.

Fix Factory HPFP Seal Leaks & Restore Fuel Pressure
One of the most common failure points in the Audi 4.2L and 6.3L HPFPs is seal deterioration, which can result in fuel seepage, pressure drops, hard starting, and drivability issues. Additionally, larger aftermarket HPFP pistons put extra stress on the factory seal, leading to tearing and fuel leakage. Our rebuild kit eliminates both issues by replacing worn or damaged HPFP seals with upgraded components, ensuring a leak-free, high-pressure fuel system.

Molybdenum Disulphide Seal for Maximum Reliability
A failing HPFP seal can cause fuel odors, rough cold starts, power loss, and potential fuel leaks into the engine bay. Our upgraded Molybdenum Disulphide Seal offers enhanced durability, superior friction resistance, and improved longevity, preventing fuel seepage and pressure loss even under extreme conditions. This seal is specifically designed to handle the higher fuel pressures found in high-performance engines, making it ideal for both stock and modified setups.

Why Choose TGK Motorsport?

• ✅ Fixes Common Factory HPFP Leaks – Direct replacement for failing OEM seals.
• ✅ Prevents HPFP Upgrade Seal Tearing – Reinforced seals withstand increased pressure from larger piston kits.
• ✅ Restores Fuel Pressure & Reliability – Prevents fuel seepage, pressure drops, and cold start issues.
• ✅ Performance & Maintenance Solution – Ideal for both daily-driven and high-horsepower builds.
• ✅ Direct Fit Replacement – No modifications required, works seamlessly with your OEM HPFP.
• ✅ Performance-Proven – Tested in real-world applications, including ethanol-tuned setups.

Seal Failure Symptoms:

• Fuel Smell Inside the Motor
• Cold Starting Issues
• Warm Starting Issues

Included in the Kit:

• ✔ 2 x Base Seal Kits – Features bottom collars with integrated seals, improving the HPFP’s sealing integrity and preventing fuel leakage.
• ✔ 2 x Cam Follower Guides – Ensures smooth interaction between the camshaft and HPFP piston, reducing wear and ensuring consistent operation.