The Best Injector Caps of 2023 – Reviewed and Top Rated
After hours researching and comparing all models on the market, we find out the Best Injector Caps of 2023. Check our ranking below.
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- Product Specifications – This diesel common rail fuel injector block-off cap set includes 5 pieces with various sizes: 12mm (M12 x1.5), 14mm (M14 x1.5), 16mm (M16 x1.5), 18mm (M18 x1.5), and 20mm (M20 x1.5). Each cap features internal thread sizes and thread intervals of 1.5, with inner diameters corresponding to each size (12mm, 14mm, 16mm, 18mm, and 20mm).
- Vehicle Compatibility – The fuel caps are designed to fit various diesel engines. The 12mm fuel cap fits Ford 6.4L (2008-2010). The 14mm fuel cap fits Ford 6.7L (2011-2022), Cummins 5.9L (2003-2009), Duramax 6.6L (2001-2005 and 2017-2022). The 16mm cap fits Cummins 6.7L (2019-2022). The 18mm cap fits Duramax 6.6L (2011-2016). The 20mm cap fits Cummins 6.7L (2007-2018) and Duramax 6.6L (2006-2010). These caps are also compatible with other vehicles with similar-sized fuel line nuts.
- High-Quality Construction - These injector rail fuel line cap block-off tool sets are made from full carbon steel for enhanced durability and long service life.
- Efficient Functionality – These diesel rail fuel injector block-off caps are designed to effectively block fuel supply to cylinders or seal the common rail pipe. This helps in diagnosing engine issues, such as identifying faulty diesel injectors or troubleshooting engine knock sounds by isolating each cylinder.
- Easy-to-Follow Instructions – To use, simply remove the diesel fuel injection line from one cylinder at a time and install the corresponding cap on the fuel rail. Increased fuel pressure indicates the faulty injector. Multiple block-off tools can be useful, as multiple injectors returning small amounts of fuel may mimic symptoms of a single injector with excessive fuel return.
- Caps Used to Block Off the Fuel Rail During Fuel Pressure Diagnostics in 2003-2022 Cummins, 2001-2022 Duramax, and 2008-2022 Ford Engines.
- Helps in identification of faulty diesel fuel injectors and used to diagnose engine knock sounds.
- Install the cap on the fuel rail in the place of the injection line.
- When the cylinder with the failed injector is capped, the rail pressure will rise and the vehicle will start.
- Set comes with five different caps.
- Fitment: This fuel rail injector caps is suitable for various diesel engines, 12mm fuel rail injector cap fits for Ford 6.4L (2008-2010), 14mm cap fits for Ford 6.7L (2011-2022), Cummins 5.9L (2003-2009), Duramax 6.6L (2001-2005 and 2017-2022), 18mm cap fits for Duramax 6.6L (2011-2016), 20mm cap fit for Cummins 6.7L (2007-2018) and Duramax 6.6L (2006-2010)
- Package Includes: 5 pack fuel injector block off caps, 12mm (M12 x1.5), 14mm (M14 x1.5), 16mm (M16 x1.5), 18mm (M18 x1.5), and 20mm (M20 x1.5)
- Function: These fuel rail block off caps are used to block the fuel supply to cylinders or seal the common rail line. This helps to find problems with the engine, for example by checking for faulty diesel injectors or finding the cause of engine knock sounds by checking each cylinder on its own
- Easy to Use: Just install the caps on the fuel rail. If the fuel pressure increases, it means that there is a problem with the injector
- Wide Compatibility - Fuel Injector Caps designed for fuel rail diagnostics in 2003-2022 Cummins, 2001-2022 Duramax, and 2008-2022 Ford engines.
- Efficient Functionality - Effectively blocks the fuel supply to cylinders or seals the common rail pipe, aiding in the identification of faulty diesel injectors and diagnosing engine knock sounds.
- Easy-to-Follow Instructions - Identify the faulty cylinder by removing the diesel fuel injection line from one cylinder at a time and installing the cap on the fuel rail. Increased fuel pressure indicates the faulty injector.
- High-Quality Construction - Made from full carbon steel with an anti-rust finish. These fuel line caps feature a galvanized surface for durability and resistance to breakage and deformation, ensuring a long service life.
- Important Note - Multiple fuel pressure block-off tools can be helpful, as several injectors returning small amounts of fuel can mimic the symptoms of a single injector returning excessive fuel.
- Material: Carbon Steel
- Inner Diameter: M14;Thread Interval: 1.5;
- Replace Parts Number # Miller 9011 / GM EN-47589-1;
- Compatible with 2001-2005 6.6L Chevy/GMC Duramax
- Compatible with Dodge / Cummins 2003-2007 5.9L
Last update on 2025-07-04 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API
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