EFI Stealth Fuel Log - 4150 Series

The Holley EFI Stealth Fuel Log 4150 Series is a precision-engineered fuel manifold designed for modern EFI-equipped engines requiring reliable, low-restriction fuel distribution. Built for performance enthusiasts and mechanics upgrading fuel systems on late-model vehicles, this component bridges the gap between traditional carburetor mounting points and contemporary electronic fuel injection setups. The 4150 series format ensures compatibility with existing engine bays while delivering the flow characteristics and durability demanded by forced-induction and naturally aspirated builds alike.

Constructed from high-quality materials and featuring braided stainless-steel fuel line integration with Vapor Guard technology, the EFI Stealth Fuel Log minimizes heat soak and fuel vaporization—critical factors in maintaining stable EFI calibration under sustained load or high underhood temperatures. The stainless braiding provides both durability and a professional appearance, while the 6 AN braided construction handles the volumetric demands of contemporary fuel injection systems without pressure drops. Vapor Guard insulation acts as a thermal barrier, keeping fuel temperature stable and preventing vapor lock conditions that would otherwise trigger limp-mode or stumble during acceleration.

This fuel log is ideal for engine swaps, EFI retrofit projects, and tuned applications where factory fuel distribution doesn't meet airflow or pressure requirements. Street machines, restomod builds, and track-oriented vehicles benefit from the stable fuel delivery and heat management the Stealth design provides. Mechanics and builders will appreciate the compact 6.5 × 3.45 × 11 inch footprint, which integrates cleanly into tight engine compartments while the lightweight 0.47 lb construction minimizes parasitic weight. Installation requires standard AN fittings and basic fuel-system plumbing knowledge; ensure all connections meet your vehicle's fuel pressure specification and consult your EFI tuner for optimal calibration.