NOS Fuel Line Adapter

NOS Fuel Line Adapters: The Nitrous-System Integration Solution

When you're building a nitrous system on a modern fuel-injected vehicle, the fuel delivery side is just as critical as the bottle and solenoids. NOS (Nitrous Oxide Systems) has long been the benchmark name in forced-induction power, and their lineup of fuel line adapters reflects that same engineering philosophy — precision-made hardware that lets you tap into your factory fuel system cleanly, without irreversible modifications.

Engineered for Late-Model Fuel-Injected Vehicles

One of the biggest hurdles when adding nitrous to a modern car is finding a clean, reliable fuel pickup point on the OEM fuel rail. NOS addresses this directly with their Late Model Billet Fuel Line Adapter series. These adapters eliminate cutting, drilling, and modifications when installing nitrous on a late model fuel injected vehicle. Simply disconnect the OE fuel hose and install the adapter between the OE fuel rail and fuel hose. It's a reversible, clean installation that preserves your factory plumbing integrity.

The product lineup covers the most common OEM fuel tube sizes found on late-model applications. Fuel line adapters are available in billet aluminum with a black anodized finish for late model fuel rails, offered in both 3/8 in. fuel tube and 1/8 in. port configurations. A 5/16 in. fuel tube variant is also available, broadening compatibility across domestic and import platforms.

Smart Multi-Port Design for Flexible Plumbing

What separates NOS fuel line adapters from generic fittings is their thoughtful multi-port architecture. The three 1/8" NPT ports can be configured in any direction for the best fit in your application. This rotational flexibility is invaluable in tight engine bays where clearance is at a premium. The -4 AN adapter is used to feed fuel to the nitrous plate, making these adapters a direct, purpose-built solution rather than a workaround.

Each kit is designed to be a complete solution out of the box. Included hardware typically consists of the main body fitting, a 1/8" NPT pipe plug with sealant in steel with nickel plating, and a 1/8" NPT male to -4 AN male adapter also in steel with nickel plating. Having all necessary components in a single package reduces guesswork and eliminates the need to source individual pieces separately.

Material Quality and Finish

NOS builds their fuel line adapters from aerospace-grade materials matched to the demands of performance fuel systems. Material used is 6061-T6 aluminum, a high-strength alloy well-suited to fuel system hardware. The black anodized finish not only provides corrosion resistance but also gives the components a purposeful, stealth look under the hood. NOS adapter fittings are machined to precise tolerances from brass or lightweight anodized aluminum, and available in a variety of sizes and colors to suit custom plumbing needs.

Barb-End Sealing for Leak-Free Performance

For the inline straight-style adapters, the sealing design is equally well-considered. These fittings feature barb ends that grip onto the hose so that you get a tight, leak-free seal, a critical requirement for any fuel system component operating under nitrous system pressure demands.

Whether you're setting up a wet nitrous plate system on a carbureted application or plumbing a multi-stage EFI setup, NOS fuel line adapters provide the engineered, bolt-in interface that keeps your fuel delivery clean and your installation professional. Browse the full selection of NOS Fuel Line Adapters and find the right fitting for your build.