Sinister Diesel Injector Seal Kit – 7.3L Powerstroke
Fits 1994–2003 Ford F-250 & F-350 Super Duty | 2000–2003 Excursion
Key Features
-
Premium replacement injector seal kit – designed for one injector on the 7.3L Powerstroke
-
Eliminates oil and fuel leaks caused by worn or hardened factory seals
-
Protects against oil-to-fuel cross-contamination and combustion gas intrusion
-
Manufactured from high-temp, fuel- and oil-resistant Viton and polymer materials
-
Direct-fit design ensures a perfect seal and easy installation
-
Meets or exceeds OEM specifications for durability and reliability
Why Upgrade to the Sinister Diesel Injector Seal Kit
Leaking injector seals are one of the most common issues on 7.3L Powerstroke engines, often leading to fuel contamination in the oil, hard starts, and rough idle. The Sinister Diesel Injector Seal Kit restores proper sealing and ensures consistent performance under high-pressure oil system demands.
We’ve tested dozens of seal materials and suppliers to find the combination that outlasts and outperforms the rest. The result is a kit that maintains flexibility, sealing integrity, and resistance to breakdown under extreme diesel heat and pressure. This is the same seal kit we trust in our in-house Powerstroke builds — proven through thousands of hours of testing and real-world use.
Product Description
The Sinister Diesel Injector Seal Kit provides the critical O-rings and seals needed to properly rebuild or service a single injector on your 1994–2003 7.3L Powerstroke. If you are servicing all eight injectors, you will need to purchase eight kits total.
Each seal is engineered from premium Viton and other high-temperature compounds that maintain elasticity and resist swelling or deterioration caused by diesel fuel and engine oil. Whether you’re replacing one faulty injector or refreshing your entire set, this kit ensures long-lasting, leak-free operation and proper injector performance.
Kit Includes
-
Complete set of premium O-rings and seals for one injector
-
Compatible with all 7.3L Powerstroke diesel injectors
Why Buy From Sinister Diesel
Since 2009, Sinister Diesel has been the trusted source for Powerstroke performance and reliability. Every part we offer undergoes in-house testing and real-world validation before it earns the Sinister name. Backed by fast shipping, U.S.-based technical support, and years of diesel expertise, you can install our parts with confidence knowing your 7.3L is protected by the best.
