Fuelab 84821-4 848 Series In-Line Fuel Filter Standard Length 75 Micron Stainless Steel w/ Check Valve

The Fuelab 848 Series In-Line Fuel Filter (84821-4) combines a high-flow 75 micron stainless steel filter element with an integrated check valve in a single, compact unit. The built-in check valve keeps fuel pressure in the system after engine and pump shutdown, helping prevent vapor buildup in the fuel rails during engine cool-down cycles.

By integrating the filter and check valve into one assembly, Fuelab eliminates the need for separate components, additional fittings, and extra plumbing. The check valve is also protected inside the filter housing, shielding it from contamination and damage. This filter is compatible with gasoline, diesel, ethanol (E85), and methanol fuel systems.

Key Features:

• 75 Micron Stainless Steel Element — cleanable and reusable for long service life
• Integrated Check Valve — maintains fuel pressure after shutdown and protects against vapor lock
• Standard Length Housing with 3-inch filter element
• -8AN Male Inlet and Outlet fittings for direct AN line compatibility
• Compatible with gasoline, diesel, ethanol, and methanol fuels
• Anodized aluminum housing for corrosion resistance and lightweight durability
• Check valve assembly is shielded inside the filter — no external exposure to contaminants

The Fuelab 84821-4 is ideal for performance fuel systems where maintaining rail pressure between starts is critical, including EFI and carbureted applications running alternative fuels. The stainless steel element can be cleaned and reused, reducing long-term maintenance costs compared to disposable filter elements.