When assembling or upgrading a fuel cell or tank, choosing robust bulkhead fittings is essential for safety and performance. This guide highlights top bulkhead fittings designed for high-pressure fuel lines and racing applications, with a focus on durability, sealing performance, and compatibility. Each product below is evaluated for material quality, seal geometry, and ease of installation to help you select the right part for your setup.
| Product | Brand | Key Feature |
|---|---|---|
| EVIL ENERGY 6AN Bulkhead to 5/16 Hose Barb | EVIL ENERGY | 6061-T6 aluminum, black anodized, 37-degree sealing angle |
| Fuel Cell Electrical Bulkhead Fitting 10GA | WMJNH | 3/8npt openings, broad wire compatibility |
| CNRAQR 6AN To 6AN Bulkhead Fittings | CNRAQR | All-aluminum 6061-T6, 37° sealing, radiused flow |
| EVIL ENERGY 6AN Bulkhead Straight | EVIL ENERGY | 9/16-18 UNF, 4000 PSI, 6061-T6 anodized |
| Jetuplusllc CFD-504 Electrical Bulkhead | Jetuplusllc | 10-12 GA wires, 3/8npt options |
Below are five carefully chosen bulkhead fittings that align with common fuel cell and tank setups. Each entry includes a concise look at construction, sealing geometry, and installation considerations to help you compare options quickly.
EVIL ENERGY 6AN Bulkhead to 5/16 Hose Barb
Material and build: A 6061-T6 aluminum alloy body with black anodized finish provides oil, rust, and corrosion resistance. The bulkhead accepts a 6AN male flare to a 5/16″ hose barb, offering a compact transition for tight installations. The sealing interface uses a 37-degree angle on the AN side, helping to achieve a reliable seal under elevated pressures. The kit includes a bulkhead nut and rubber washers to aid sealing and assembly. This combination is suitable for racing fuel tanks and high-performance fuel cells that require a robust, leak-tight connection.
Installation notes: Ensure the mating hose barb is properly sized for 5/16″ hose and confirm the AN6 male threads match your fuel line hardware. A compatible AN wrench should be used to prevent overtightening and cross-threading. Regular inspection for looseness or wear is recommended in high-vibration environments.
Fuel Cell Electrical Bulkhead Fitting 10GA
Overview: This bulkhead is designed for 10-12 gauge wires with 3/8npt thread openings, enabling a broad range of fuel pump and sensor integrations. It’s positioned as a versatile option for various fuels, including E85, gasoline blends, race fuels, and methanol, making it suitable for both street and track setups. The body is constructed from high-temperature resistant plastic, with precision processing to ensure durability and light weight in demanding environments.
Considerations: While plastic construction reduces weight, it’s essential to confirm temperature exposure and chemical compatibility for your specific fuel mix. The 3/8npt thread opening provides a common mounting footprint, but verify your mounting hardware and seal requirements to maintain a leak-free connection over time.
CNRAQR 6AN To 6AN Bulkhead Fittings
Design and materials: All-aluminum construction using 6061-T6 with black anodized finish provides corrosion resistance and strong thread engagement. The fittings feature a 37° sealing angle for a positive seal at high operating pressures and radiused entries to reduce flow restrictions. The kit includes two pieces, offering a straightforward upgrade path for dual-line fuel cell connections. They are compatible with gasoline and alcohol-based fuels, making them versatile across different racing formulations.
Installation guidance: Use an AN adjustable wrench for proper torque as the pre-formed packaging seats into the mating part. Tighten until snug to ensure an effective seal without risking galling or stripping. Regular checks for seal integrity help maintain reliability in performance applications.
EVIL ENERGY 6AN Bulkhead Straight
Specifications: Thread size is 6AN with 9/16-18 UNF, designed for high-pressure fuel lines. The construction uses aluminum 6061-T6 with a black anodized finish for corrosion resistance and durability. The assembly supports a maximum working pressure of about 4000 PSI and operates across a wide temperature range, suitable for performance engines and fuel cells under demanding conditions.
Practical considerations: The straight bulkhead provides a direct run between the tank and line, minimizing bends that can create pressure drop and turbulence. Ensure compatible connections and proper sealing washers to avoid leaks in high-vibration environments typical of racing.
Fuel Cell Electrical Bulkhead Fitting 10GA CFD-504
Overview: CFD-504 is designed for 10-12 gauge wires used with fuel pumps and dual-pump assemblies such as Walbro 450. It features electrical bulkhead connectivity along with 3/8npt thread openings, enabling reliable integration into fuel delivery systems. This unit targets performance builds requiring robust electrical feed-through for pumps and sensors, with a focus on compatibility with common high-performance pumps and E85-type fuels.
Installation and compatibility: Confirm the wire gauge and connector type before installation, ensuring a clean pass-through and secure sealing at the fuel line interface. The 3/8npt openings are common, but confirm thread engagement with your specific fuel cell or tank adaptor.
Fuel Cell Electrical Bulkhead Fitting 10GA (WINDRAWNVN)
Details: This bulkhead fits 10-12 gauge wires to 3/8npt openings, with extensive compatibility for Bosch and VW interchanges. It supports a broad spectrum of fuel pump configurations, including E85 dual-pump assemblies. The design emphasizes wide compatibility for wiring and fuel-path interfaces, suitable for varied fuel types and configurations across performance vehicles.
Dewhel -6AN Male Flare Bulkhead To 5/16 Hose Barb
Configuration: This DEWHLEH bulkhead provides a -6AN male flare to 5/16″ hose barb, including one bare aluminum fitting, one bare aluminum bulkhead nut, and two rubber washers. It’s designed for fuel tanks and cells where a compact, corrosion-resistant aluminum interface is needed. The components are designed to resist fuel-specific solvents and high-pressure environments common to racing fuel systems.
EVIL ENERGY 8AN Bulkhead Straight
Details: The 8AN bulkhead uses a 3/4-16 UNF thread with 6061-T6 aluminum and a black anodized finish. It’s engineered for high-pressure fuel lines and aggressive temperature ranges, with a maximum working pressure around 4000 PSI. The anodized surface provides durability against fuel exposure and environmental factors in performance installations.
Buying Guide: Key Considerations For Fuel Cell Bulkhead Fittings
- Material and finish: Aluminum 6061-T6 with black anodizing is common for strength and corrosion resistance, but consider stainless steel options for extreme environments or incompatible fuels.
- Sealing geometry: Look for 37-degree sealing interfaces and clean radiused entry paths to minimize leaks and flow resistance at high pressures.
- Thread size and compatibility: Ensure the AN size (e.g., 6AN, 8AN) matches your hoses and adapters, and verify openings (3/8npt, etc.) align with your pump fittings.
- Temperature and pressure ratings: High-performance setups may require fittings rated for thousands of PSI and wide temperature ranges; confirm specs match your engine bay conditions.
- Ease of installation: Seek built-in washers, nuts, and simple torque requirements; improper torque can lead to leaks or galling of aluminum parts.
- Fuel compatibility: Confirm the fitting material and gaskets are proven for gasoline, E85, methanol, or race fuels used in your plan to avoid degradation.
- Maintenance and inspection: Regularly inspect seals and threads for wear, corrosion, or cracks, especially in racing environments with vibration and fuel exposure.
- Weight versus durability: Some plastic bulkheads offer weight savings but may compromise longevity; weigh the benefits against your performance goals.
In summary, selecting the right bulkhead fitting involves matching the intake and output sizes, ensuring robust sealing, and confirming material compatibility with your fuel type. The options above provide a spectrum from lightweight plastic variants to heavy-duty aluminum bulkheads designed for high PSI and racing applications. When integrated with a compatible fuel cell or tank, these fittings help maintain fuel integrity, reduce leakage risks, and support reliable performance across conditions.