2-1/4 O.D. Fill w/ Flapp er Valve Assy. 1-1/2 Ve

The 2-1/4 O.D. Fill with Flapper Valve Assembly (ATL PT-BG-040) is a critical fuel system component engineered for high-performance and racing applications where fuel cell safety and reliability are non-negotiable. This assembly serves as the fill neck outlet, allowing controlled fuel entry into ATL fuel cells while the flapper valve mechanism prevents fuel backflow and siphoning during aggressive driving, cornering, or impact events. Whether you're building a street performance machine, road race platform, or dedicated motorsports vehicle, this fuel filler assembly ensures your fuel delivery system remains secure and compliant with racing fuel cell standards.

Constructed with a 2-1/4 inch outer diameter, this filler neck integrates seamlessly with ATL fuel cell baffles and mounting systems, providing a robust connection point for your fuel cap and fill hose. The integrated flapper valve operates passively—opening under normal fuel fill pressure and automatically closing when pressure reverses—eliminating the need for additional check valves or complex fuel system plumbing. The assembly's compact footprint (9.6 x 6.85 x 18.15 inches) fits cleanly into tight engine bays and fuel cell installations, while the 3.925 lb weight keeps rotational mass minimal. ATL's engineering ensures smooth fuel flow during fill operations without restriction, critical for quick pit stops and efficient refueling in competition environments.

This fuel filler assembly benefits road racers, autocross competitors, oval track drivers, and dedicated performance enthusiasts who demand OEM-equivalent reliability from their fuel system components. The 1-1/2 inch inlet connection accepts standard fuel fill hoses and cap adapters, making integration straightforward during fuel cell installation or fuel system upgrades. Proper installation requires mounting the assembly to your ATL fuel cell's fill neck boss with appropriate fasteners (not included) and ensuring the flapper valve operates freely before pressurizing the fuel system. For maximum longevity, periodically inspect the flapper mechanism for debris and verify that your fuel cap seats properly—a loose cap can compromise the valve's effectiveness during hard cornering or crash scenarios.