The legendary Mercury / Bosch fuel injector OEM part numbers 98818 and 988181 are now No Longer Available (NLA) through Mercury.
These injectors were the factory Bosch units used on some of the most iconic Mercury Racing EFI two-strokes, including the 2.0 Liter F1, 2.4 Liter EFI, and 2.5 Liter EFI engine families—well known in the performance world for platforms like the Bridgeport, 260 EFI, 280 ROS, 300 Drag, and S3000.
To keep these engines running the way they were meant to run, Buckshot Racing #77 now offers a Made-in-the-USA High-Flow replacement fuel injector built specifically to replace the legacy injector set used on these motors. If your application calls for 98818 or 988181, our replacement injector is designed to take its place in the factoru rail and block interface.
What These Injectors Do on Mercury Racing EFI Engines
On Mercury Racing 2.0L, 2.4L, and 2.5L EFI engines, the injector mounts in the fuel rail and seals into the side of the block using dedicated grommets and O-rings. The ECU controls injector pulse width in milliseconds, metering the correct amount of regulated fuel into each cylinder’s intake path based on load and RPM.
Because these legacy EFI motors are commonly spun high and driven hard, injector health isn’t a “nice to have.” Correct injector flow and spray behavior support clean idle, crisp throttle response, strong mid-range acceleration, and safer air/fuel ratios at wide-open throttle.
Why an Accurate Replacement Matters Now That 98818 Is NLA
A purpose-built Made in the USA replacement helps avoid the common pitfalls of mismatched injectors—uneven cylinder fueling, reduced tuning margin, and inconsistent behavior from one cylinder to the next.
Common Symptoms of a Failing 98818 / 988181 Injector
As the original injectors age, they can develop varnish buildup, contamination, internal wear, or coil issues. Problems may show up as a rough idle, a single-cylinder miss under load, hesitation when you roll into the throttle, or a noticeable loss of RPM and speed at the top end.
A stuck-open injector can flood a cylinder, leaving wet plugs and a strong fuel smell. A restricted injector often shows up more dangerously as lean behavior—hotter cylinder readings, rough high-RPM operation, or plug readings that don’t match the rest. On performance boats, small flow differences can show up in EGT and plug checks before the average boater notices anything.
Cleaning and flow testing can sometimes bring an injector back into spec if the internal components are still healthy—but with OEM 98818 / 988181 now NLA, replacement is often the smarter long-term move when an injector is physically damaged, corroded, or inconsistent.
If you currently have a set of Factory Injectors, feel free to send them to us for cleaning and flowing. We have a 97% success rate restoring old Mercury Injectors.
Known OEM Numbers and Search Variations
This replacement targets the factory injector family commonly searched and referenced as:
98818, 988181, and in some catalogs 8M0192275.
If your rail/block setup and parts list reference any of the numbers above, you’re in the correct injector family for this Made-in-USA Buckshot Racing #77 replacement.
Seals, Grommets, and Hardware That Matter
The injector is only one piece of a sealed EFI system. On these side-injected Mercury Racing blocks, the upper and lower grommets as well as the holders and studs are critical to prevent fuel leaks and to prevent unmetered air from entering the intake path.
Parts diagrams commonly reference seals and grommets such as 25-99123 and 26-94219 used with the injector family identified as 24-98818, along with hold-down and rail hardware like brackets (98716) and spacers (98717).
Worn grommets, hardened O-rings, or damaged hold-down hardware can cause poor sealing, inconsistent injector seating, and tuning headaches that look like “fuel issues” but are really air hookup/leak issues.
Buckshot Racing #77 also supplies key EFI service parts that support proper injector service and installation, including injector filter screens, Mercury EFI hose, studs, hold-down brackets and the correct grommets and seals.
The original Mercury/Bosch injectors 98818 and 988181 helped define the performance of Mercury Racing’s 2.0L F1, 2.4L, and 2.5L EFI outboards. Now that these OEM injectors are No Longer Available (NLA), the right replacement matters more than ever.
The Made-in-the-USA high-flow replacement fuel injector from Buckshot Racing #77 is built to replace the injectors used across these legacy Mercury Racing EFI platforms—helping owners keep Bridgeport, 260 EFI, 280 ROS, 300 Drag, and S3000 engines running clean, responsive, and reliable.
Includes one (1) Fuel Injector (six (6) are required for the V6)
For technical support, contact Mike Hill at +1-714-697-1716 or mike@buckshotracing77.com