aFe Power Diesel Fuel System - Boost Activated for GMC Sierra 3500 HD Duramax 2017 - 2019

Built-in Bypass For Stock Fuel System: Allows vehicle to run on stock fuel pump under light loads. Clear High-Impact Polycarbonate Sight Glass: Allows visual inspection of fuel. Helical Bronze Spur Gears: Bronze gears more forgiving of contaminants than steel gears. The helical spur gear design runs quieter than straight cut gears. Billet 6061-T6 Aluminum Manifold: Eliminates porosity concerns with cast aluminum. "Marine Grade" Motor: Protected against dust intrusion and powerful water jets. Plug & Play Installation: Supplied harness attaches directly to battery and utilizes Deutsch weather-proof connectors. No cutting or modifications of the stock fuel lines required. Vehicle can easily be returned to stock. Boost Activated Pump Engagement: Supplied preset boost switch activates pump only under load, reducing wear & tear on the DFS780 pump. PEEK Bearing Wear Surfaces: The DFS780 spur gears ride on PEEK (Polyether Ether Ketone) bearing surfaces to reduce both noise and wear. Contoured CNC Machining Of Manifold Passages: Enhances flow through the manifold to reduce pressure drop due to flow restrictions. Direct Bolt-on Steel Mounting Bracket: Heavy duty bracket mounts to the frame and utilizes existing hole to secure. Fuel Pressure Gauge Port: 1/8 IN NPT port allows customer to attach an external pressure gauge to monitor fuel pressure. O. E Quality Viton Seals: Compatible with diesel and biodiesel fuels. Emissions Disclaimer: Some or all of the applications listed are 50-state exempt, please see CARB EO# D-550-37 for details.