The Buckshot Racing #77 3/8" high-flow inline fuel filter is built as a performance replacement for the Mercury Racing-style inline fuel filter used on many high-output Mercury EFI and carbureted two-stroke outboards.
 
It is commonly compared to the Mercury Racing OEM fuel filter 818700T, also referenced as 35-818700T, along with related Mercury numbers 818700, 818700A1, 818700A3, 818700A4, 818700A5, 818700A6, and 8M0050833.
 
This inline filter uses 10–13 micron filtration and is well suited for serious Mercury performance applications, including Mercury 2.4L EFI, 2.5L EFI, 260 ROS, 280, S3000, SST-120, 300 Drag, offshore outboards, lake-race boats, tunnel boats, drag boats, and high-performance bass boat fuel systems.
 
Replacement for Mercury Racing 818700T Applications
 
The Mercury Racing 818700T fuel filter family has long been used in high-performance Mercury outboard fuel systems where fuel flow, filtration quality, and reliability matter at high RPM and wide-open throttle.
 
This Buckshot Racing #77 high-flow filter is a strong replacement option for Mercury Racing-style setups using 3/8" fuel hose, dual 3/8" barb-style connections, or compatible -6AN push-lock hose arrangements. It is also commonly compared to Kinsler and Holley 562-1 inline filters used in performance fuel systems.
 
Older Mercury performance references may also include 35-93011, especially in certain Mercury 2.4 Liter EFI and Hi-Performance fuel filter applications. Because Mercury used different fuel system layouts across EFI, carbureted, offshore, and racing engines, always compare the original filter, hose size, flow direction, and fitting style before installation.
 
Why 10–13 Micron Filtration Matters
 
High-performance Mercury two-stroke engines depend on stable fuel pressure and clean fuel delivery. Dirt, tank debris, ethanol-related residue, deteriorated fuel hose material, varnish, and corrosion can restrict injectors, carburetor passages, fuel rails, needle seats, and pressure regulators.
 
The 10–13 micron rating provides fine filtration for EFI systems while maintaining the fuel flow required by high-output Mercury Racing outboards. On engines such as a 260 ROS, 280, S3000, SST-120, or 300 Drag, a fuel restriction at high RPM can quickly become a lean-running problem. Clean fuel and proper flow are part of the engine’s safety margin.
 
Built for EFI and Carbureted Mercury Two-Strokes
 
This high-flow inline fuel filter is suitable for both electronic fuel injection and carbureted Mercury outboard fuel systems when the size, fitting style, and flow requirements match the engine setup.
 
Common applications include 2.4L EFI, 2.5L EFI, 260 EFI / ROS, 280 ROS, SST-120, S3000, 300 Drag, and similar Mercury Racing-style engines. It is also useful for custom offshore rigging, drag boat fuel systems, lake-race setups, and bass boat applications where a compact, high-flow inline filter is preferred.
 
Technical Specifications
 
This high-flow inline fuel filter is made in North America and built with a durable stainless steel housing for corrosion resistance in demanding marine environments. It is rated at approximately 10–13 microns and designed for 3/8" fuel line applications.
 
Approximate dimensions are 5.55 inches overall length and 2.16 inches outside diameter. The compact inline design works well in Mercury Racing and Hi-Performance fuel systems where space, serviceability, and fuel delivery are important.
 
Replacement Interval and Service Notes
 
For recreational performance boats, inspect the fuel filter at least once per season and replace it annually, or sooner if the boat sits for long periods, runs ethanol fuel, or shows signs of contamination.
 
For race boats, offshore boats, drag boats, and high-RPM Mercury Racing engines, inspect the filter more often and consider replacement as part of regular race-season maintenance.
 
Replace the filter immediately if you see fuel restriction, falling fuel pressure, debris in the filter, varnished fuel, water contamination, deteriorated hose material, or repeated lean-running symptoms. If a filter plugs repeatedly, inspect the tank, pickup tube, anti-siphon valve, primer bulb, fuel hose liner, water-separating filter, and fuel pump supply side.
 
Install the filter in the correct flow direction and mount it where it can be inspected and serviced. Keep fuel lines away from heat, sharp edges, throttle linkage, steering components, and vibration points. Use quality marine fuel hose, proper clamps or AN-style connections, and verify the system is leak-free before running the engine.
 
Buckshot Racing #77 Tech Tip
 
When replacing a Mercury Racing-style 818700T / 35-818700T fuel filter, verify fuel pressure and fuel flow after installation whenever possible. The fuel pump, tank vent, pickup, hose size, regulator, and injector or carburetor condition all affect how the engine performs under load.
 
For Mercury Racing engines such as 260 ROS, 280, S3000, SST-120, and 300 Drag, stable fuel delivery is critical. The right filter helps protect the fuel system while supporting the flow needed for high-RPM two-stroke performance.
 
Final Thoughts
 
The Buckshot Racing #77 3/8" high-flow inline fuel filter is a strong replacement option for Mercury Racing and Mercury Hi-Performance fuel systems requiring fine filtration and high-volume fuel delivery.
 
With 10–13 micron filtration, stainless construction, 3/8" fuel compatibility, and part number coverage for Mercury Racing 818700T, 35-818700T, 818700, 818700A1, 818700A3, 818700A4, 818700A5, 818700A6, 8M0050833, 35-93011, Kinsler, and Holley 562-1, it is built for serious Mercury EFI, carbureted, offshore, bass boat, and racing outboard applications.
 
For high-performance Mercury two-stroke owners, fuel filtration is engine protection.
 
Optional: Dealer 10-Packs: Buy 10, Save $50
 
Contact Mike at 714-697-1716 or mike@buckshotracing77.com for technical support.