Mysttoo 5PCS Common Rail Fuel Injector Block-Off Caps — 12–20mm Diesel Cap Kit for Cummins, Duramax & Ford
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Description
xOverview
The Mysttoo 5PCS Common Rail Fuel Injector Block-Off Caps are a purpose-built diagnostics tool for diesel engines. This full kit provides five precision caps that help you isolate fuel flow during pressure testing, making it easier to observe changes in the system without external interference. The caps are designed to fit a range of commonrail systems and work with long-running engines, from on-car checks to bench tests, giving you a practical option for routine maintenance and troubleshooting.
Key benefits during diagnostic work
- Block off the fuel rail during pressure diagnostics to create controlled testing conditions.
- Assist in identifying faulty injectors and clarifying engine knock sounds by isolating individual cylinders.
- Seal the common rail pipe area to minimize fuel leakage and protect test integrity.
- Designed to support precise diagnostics across multiple engine families without disturbing normal operation of other cylinders.
Durable build for reliable testing
Crafted from high-quality carbon steel, these caps emphasize durability with anti-rusting and anti-stripped properties. The robust construction helps maintain a tight, consistent seal during testing, enabling repeatable results in demanding workshop environments. The combination of strength and corrosion resistance makes the caps suitable for repeated use across many diagnostic sessions.
What’s included
- 5 injector caps in sizes: M12x1.5, M14x1.5, M16x1.5, M18x1.5, M20x1.5
- Comprehensive kit that covers the common rail configurations found on popular diesel platforms
How to use
- Identify the correct cap size for your injector port and ensure threads are clean.
- Install the appropriate cap onto the cylinder port to seal the rail during testing.
- Perform the pressure test or diagnostic procedure, monitoring for changes in sound, pressure, or injector behavior.
Compatibility and warranty
Compatible with 2003–2022 Cummins engines, 2001–2022 Duramax engines, and 2008–2022 Ford Powerstroke units. The kit includes a 24-month quality guarantee, reflecting Mysttoo’s commitment to customer satisfaction and reliable tooling performance.
Why choose Mysttoo
Mysttoo focuses on practical, field-ready tools that support real-world maintenance workflows. These injector block-off caps offer a straightforward, repeatable approach to fuel rail testing—helping you work more confidently, efficiently, and safely in a busy shop or garage setting.
FAQ
Q: Which engines are compatible with the Mysttoo 5PCS Common Rail Fuel Injector Block-Off Caps?
A: Compatible with 2003–2022 Cummins, 2001–2022 Duramax, and 2008–2022 Ford Powerstroke engines.
Q: What does the kit include and what material is used?
A: Includes five caps (12, 14, 16, 18, 20 mm) made from carbon steel for durability and corrosion resistance.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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