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 designed for high-performance and racing applications where fuel cell safety and reliability are essential. 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 or impact events.

Constructed with a 2-1/4 inch outer diameter and a 1-1/2 inch inlet connection size, this filler neck integrates seamlessly with ATL fuel cell baffles and mounting systems. 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.

This fuel filler assembly is particularly beneficial for road racers and autocross enthusiasts, ensuring that their fuel delivery system remains secure and compliant with racing fuel cell standards. ATL's engineering guarantees smooth fuel flow during fill operations without restriction, which is critical for quick pit stops and efficient refueling in competitive environments.