Filler Cap Flush Mount Poly

The Filler Cap Flush Mount Poly from ATL FUEL CELLS is engineered for serious fuel system builds where clean aesthetics and reliable sealing are non-negotiable. Whether you're running a custom fuel cell in a track car, race vehicle, or high-performance street machine, this flush mount cap eliminates the protruding filler neck that mars your engine bay while maintaining a secure, leak-proof connection. Builders and fabricators choose this component when OEM fuel door solutions won't accommodate aftermarket fuel cell dimensions or when weight reduction and visual integration are priorities.

Constructed from durable poly material, the filler cap delivers superior chemical resistance to modern fuel blends, ethanol-enhanced gasoline, and methanol racing fuels without degrading or warping over time. The flush mount design integrates directly into your fuel cell mounting point, requiring minimal clearance modification and allowing you to run a streamlined fuel door or panel without interference. The compact 5.4 x 2.65 x 5.5 inch footprint at just 0.94 lbs ensures it won't add unnecessary weight to your fuel system assembly, while the engineered polymer compound resists UV damage and maintains its seal integrity across extended storage and aggressive driving conditions.

This cap is ideal for fabricators upgrading from stock fuel tanks to ATL fuel cells or compatible aftermarket units that require a flush-mount solution. Installation involves matching the cap threading to your fuel cell's filler neck diameter and securing it firmly—no special tools required, though thread-locking compound is recommended for vibration-prone applications. Professional shops and weekend warriors alike rely on ATL FUEL CELLS components for consistency and durability; this poly filler cap maintains that reputation by delivering years of maintenance-free sealing in demanding motorsport and custom vehicle environments.