Fuel Rail Adapter - 1/16innpt to -4an

The Fuel Rail Adapter - 1/16in NPT to -4AN from AutoMeter is an essential plumbing component for any serious fuel system modification or custom engine build. Whether you're transitioning from OEM NPT threaded fuel rails to modern -4AN AN hose fittings, or integrating aftermarket fuel pressure gauges and accessories, this adapter bridges incompatible connection standards seamlessly. Mechanics and performance enthusiasts rely on proper fuel system adapters to eliminate leaks, ensure consistent fuel delivery, and maintain system integrity under boost or high-revving conditions.

This adapter features a 1/16 inch NPT (National Pipe Thread) male inlet that mates with factory or aftermarket fuel rail ports, and a -4AN female outlet that accepts standard -4 AN hose fittings with JIC 37-degree flare ends. The compact design—measuring just 3.2 x 0.9 x 3.8 inches and weighing only 0.05 lbs—allows installation in tight engine bay locations without compromising accessibility or clearance. Constructed from durable materials rated for fuel system pressures, this AutoMeter adapter resists corrosion and vibration-induced loosening, making it a reliable choice for street, strip, or road course applications.

Ideal for turbocharged, supercharged, or naturally aspirated builds, the Fuel Rail Adapter is commonly used when installing aftermarket fuel pressure gauges, fuel lines, or upgrading to a custom fuel rail system. Installation requires only basic hand tools and standard plumbing practice—apply appropriate thread sealant to the NPT side and torque the AN fitting to specification. This adapter works seamlessly with most fuel rail configurations and is a must-have for any serious fuel system upgrade, DIY tuning project, or professional shop performing fuel system diagnostics and modifications.