#6 Fuel Cell Bulkhead

The #6 Fuel Cell Bulkhead from Russell is a precision bulkhead fitting engineered for high-pressure fuel system applications in performance vehicles and race-prepped builds. Designed for mechanics and enthusiasts running custom fuel injection systems, this straight-through bulkhead connector serves as a sealed pass-through component that allows you to transition fuel lines between compartments—typically from a fuel cell mounted in the trunk or rear of a vehicle into the engine bay—without compromising system integrity or flow. Whether you're building a fuel system from scratch or upgrading an existing setup, this fitting eliminates the need for external adapters that complicate plumbing and create potential leak points.

Constructed from aluminum and finished in black anodize, the #6 Fuel Cell Bulkhead features dual 6 AN male threads (straight configuration) with a reinforced bulkhead nut and PTFE washer included for secure, leak-free installation. The AN6 (6 AN) port size accommodates 3/8-inch ID fuel hose or equivalent hard-line tubing, making it compatible with mid-to-high-flow fuel delivery systems typical of turbocharged, supercharged, or naturally aspirated performance engines. PTFE (Teflon) washers prevent galling and ensure a perfect seal even under 100+ PSI fuel pressure, while the anodized aluminum construction resists corrosion and vibration loosening—critical in motorsports and long-term reliability applications. The straight-through design minimizes turbulence and pressure drop, preserving fuel system efficiency.

This bulkhead fitting is ideal for custom fuel cell installations, relocatable fuel systems, and any build requiring a clean, internal pass-through between separate compartments. Installation involves drilling a matched hole through your fuel cell wall or firewall, seating the bulkhead from one side, and threading both AN6 male connections from opposite sides—a five-minute job with a wrench. Russell's reputation for quality ensures compatibility with OEM and aftermarket fuel pumps, regulators, and filters; cross-reference your system's total flow requirements (typically 40–60 gallons per hour for street performance) to confirm sizing. Compact at 2.85 x 1.65 x 5.6 inches and weighing just 0.07 lbs, this fitting adds virtually no weight or complexity to your fuel architecture.