Sinister Diesel Billet Fuel Plug/Cap – 2013+ Cummins
Fits 2013–Present Ram 2500/3500 with 6.7L Cummins Diesel
Note: This fuel plug replaces the factory plug found inside the filler neck on pickup models. It is not the same style as the traditional screw-on or snap-fit caps used on flatbeds or cab-and-chassis setups.
Key Features
• CNC-machined from solid T6-6061 billet aluminum for superior strength
• Anodized in Sinister Blue for durability and custom appearance
• Laser-etched Sinister Diesel logo
• Tight-sealing Viton O-ring prevents dirt, dust, and moisture intrusion
• Integrated magnet in the base allows secure storage on the fuel door or body panel while fueling
• Direct replacement for the flimsy factory plastic filler-neck plug
• 2-year warranty
Product Overview
The Sinister Diesel Billet Fuel Plug/Cap is the perfect upgrade for 2013+ Ram Cummins owners who want better protection for their fuel system. The factory plug is a small plastic piece that wears out easily and offers limited sealing capability. Our billet aluminum plug replaces it with a precision-machined, O-ring–sealed solution that keeps contaminants out of your tank.
Finished in Sinister Blue and laser-etched for a clean look, this plug combines durability with style. A built-in magnet allows you to securely attach the plug to your truck while fueling, preventing drops, misplacement, or contamination. Because this part is designed specifically for pickup filler-neck plugs, it does not replace traditional screw-on caps used on cab/chassis or flatbed trucks.
What’s Included
• (1) Sinister Diesel Billet Fuel Plug/Cap
• (1) Viton O-ring
Frequently Asked Questions (FAQ)
Q: Does this replace a traditional screw-on fuel cap?
A: No. This plug replaces the small factory insert plug found in pickup filler necks. Trucks with screw-on or snap-fit caps (such as cab-and-chassis or flatbed applications) use a different style of cap.
Q: Will this trigger a check engine light or fuel system warnings?
A: No. The plug functions exactly like the factory insert and does not affect pressure sensors or EVAP-related systems.
Q: Is the magnet safe for painted surfaces?
A: Yes. The magnet is strong enough for secure storage during fueling, but we still recommend placing it on a clean surface to avoid debris scratching the paint.
Q: How long does the O-ring last?
A: Viton O-rings are extremely durable. Under normal use, they last many years, but they are inexpensive and easy to replace if needed.
Q: Will it fit my 2013+ truck?
A: Yes, as long as it is a standard pickup model. Cab/chassis models with traditional threaded caps are not compatible.
