Extended Inline Filler Neck 1.25 Into 1.25

The MOROSO Extended Inline Filler Neck (1.25" to 1.25") is a precision-engineered hose adapter designed for custom fuel system installations in performance and race applications. This aluminum filler neck extension accommodates 1.25-inch hose connections on both inlet and outlet sides, with an integrated 1/8-inch NPT hose barb for secondary breather or overflow line routing. The extended design allows flexible fuel tank neck positioning, critical for fitment in tight engine bays where standard filler necks cannot accommodate the desired tank location or mounting angle.

Constructed from aluminum for weight savings and corrosion resistance, the inline design maintains a natural finish and supports hose-barb connections for reliable, vibration-resistant fuel line attachment. The 1/8-inch NPT secondary port enables integration of fuel overflow tubes, fuel return lines, or vapor recovery systems—a feature essential in high-performance builds where fuel sloshing and thermal expansion demand controlled venting. At 0.61 lbs and compact dimensions (4.55" × 4.35" × 5.75"), this filler neck adds minimal weight and installation complexity while delivering the plumbing flexibility custom fuel systems require.

Builders and fabricators select extended inline filler necks when OEM fuel tank geometry, engine bay layout, or custom fuel cell positioning demands non-standard plumbing routes. Street rods, custom hot rods, race cars, and heavily modified engines frequently require this type of adapter to bridge the gap between tank and engine compartment fuel line access points. The MOROSO part number 63483 is recognized within the custom automotive and racing community as a dependable component for fuel system integration projects where standard filler necks fall short.