---
product_id: 2594096
title: "Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium"
brand: "sierra"
price: "€ 30.10"
currency: EUR
in_stock: true
reviews_count: 11
category: "Sierra"
url: https://www.desertcart.ie/products/2594096-sierra-international-18-7866-10-micron-high-capacity-fuel-water
store_origin: IE
region: Ireland
---

# 99.8% emulsified water removal 90 GPH high flow rate 10 Micron particle filtration Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium

**Brand:** sierra
**Price:** € 30.10
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your engine running smooth — don’t let water slow your flow!

## Quick Answers

- **What is this?** Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium by sierra
- **How much does it cost?** € 30.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/2594096-sierra-international-18-7866-10-micron-high-capacity-fuel-water)

## Best For

- sierra enthusiasts

## Why This Product

- Trusted sierra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal Fit, Seamless Upgrade:** Compatible with Yamaha MAR-FUELF-IL-TR and a wide range of marine engines.
- • **Precision Filtration at 10 Microns:** Filters particles as small as 10 microns, safeguarding sensitive fuel systems.
- • **Crystal-Clear Fuel, Peak Performance:** Removes over 99.8% of emulsified water to protect your engine.
- • **High-Capacity Flow for Power Demands:** Delivers up to 90 gallons per hour to feed even the most demanding motors.
- • **Trusted Legacy, Guaranteed Reliability:** Backed by Sierra’s industry-leading warranty and 50 years of marine expertise.

## Overview

The Sierra 18-7866 is a high-capacity 10 micron fuel water separator filter designed to remove over 99.8% of emulsified water and filter particles down to 10 microns. With a robust flow rate of 90 GPH, it protects sensitive inboard, sterndrive, and outboard fuel injection systems, ensuring optimal engine performance. Compatible with Yamaha MAR-FUELF-IL-TR and backed by Sierra’s 50-year marine industry reputation and warranty, this filter is a reliable upgrade for any serious boater.

## Description

Sierra 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR DETAILS Sierra Fuel Water Separators Remove over 99. 8% of Emulsified Water from your Gasoline Over 90% Efficient at Removing Particles as small as 10 Micron AND Flow at 90 GPH to Feed even the Hungriest Motor Sierra 10 Micron Filters are Recommended to prevent Damage to Sensitive Inboard, Sterndrive and Outboard Fuel Injection Systems Replaces: Yamaha MAR-FUELF-IL-TR Filter Size: High Capacity - 6" or 152. 4 mm Rating: 10 Micron Flow: 90 GPH ABOUT SIERRA Sierra is dedicated to protecting you and your investment. For 50 years Sierra, one of the most trusted names in the marine industry, has proudly been offering high quality engine and drive parts. Their products meet or exceed the original equipment part it replaces and are engineered to meet today's high horsepower engine demands while withstanding the harsh marine environment. SIERRA'S CUSTOMER SATISFACTION All Sierra parts qualify for Sierra's Industry Leading Customer Satisfaction . Sierra warrants its products to be free of defects in workmanship and materials for the useful life of the product. If a Sierra product fails to comply with the , Sierra will repair or replace the defective product free of charge. The is subject to additional terms, conditions and limitations. You can view Sierra's full located above in the Technical Specification Section.

Review: great product - as described, good product, i've been using this brand filter for a long time and have had no issues
Review: It works great - Installed into an existing base, prefilled the filter then ran several gallons of fuel through thru. I collected a sample in a clear clean glass jar and sealed the jar. I’ve watched this jar for about two weeks, no debris or indication of contamination of any sort. Prior to this fuel/water seperator I had been experiencing poor outboard performance that has now gone away.

## Features

- Sierra Fuel Water Separators extract over 99.8 percent emulsified water from gasoline
- Universal Fit
- To protect sensitive inboard, sterndrive, and outboard fuel injection systems, Sierra 10 Micron Filters are recommended
- Item model number: 18-7866

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000N9I500 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #12,850 in Automotive ( See Top 100 in Automotive ) #33 in Powersports Fuel System Products |
| Brand | Sierra |
| Customer Reviews | 4.8 4.8 out of 5 stars (867) |
| Date First Available | February 6, 2007 |
| Exterior | Machined |
| Global Trade Identification Number | 00808282187330 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.3 pounds |
| Item model number | 18-7866 |
| Manufacturer | Teleflex |
| Manufacturer Part Number | 18-7866 |
| Model | Fuel Filter |
| OEM Part Number | YAMAHA MAR-FUELF-IL-TR |
| Outer Material | Aluminum or Stainless Steel |
| Product Dimensions | 6 x 4 x 4 inches |
| Product Grade | Replacement Part |
| Style | Fuel Water Separators |
| UPC | 808282187330 |
| Vehicle Service Type | All Vehicles, RV, Campers, Boats, Trucks, Cars. Universal |

## Product Details

- **Brand:** Sierra
- **Item Weight:** 0.59 Kilograms
- **Outer Material:** Aluminum or Stainless Steel
- **Product Grade:** Replacement Part
- **Vehicle Service Type:** All Vehicles, RV, Campers, Boats, Trucks, Cars. Universal

## Images

![Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium - Image 1](https://m.media-amazon.com/images/I/71qNyvGzzOL.jpg)
![Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium - Image 2](https://m.media-amazon.com/images/I/61kXp2tgp1L.jpg)
![Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium - Image 3](https://m.media-amazon.com/images/I/81P+AOC-C9L.jpg)

## Questions & Answers

**Q: Will this work on a Yamaha 90 hp outboard**
A: The filtering size (10 micron) and flow rate capacity (90gph) will be more than enough for a 90HP outboard.  However, there are two other important factors:  
1. Make sure that the thread size of your filter mounting bracket, often referred to as the filter head, matches that of the filter you're purchasing.  For example, if your boat was originally configured with a Johnson or Evinrude and the filter head wasn't changed when the Yamaha was installed, then it's possible that the filter head had a 1"-14 thread.  If the boat was originally configure with a Mercury or Yamaha engine, then it's most likely 11/16"-16 thread.   The 18-7866 uses an 11/16"-16
2.  Be sure you have enough space between the filter head and whatever is below it to be able to install the filter.  The 18-7866 is taller than many other filters so for example if your filter head was installed close to the deck then you might not be able to use the taller filter.  The 18-7866 is 6"  tall.

**Q: Does this work with the yamaha bracket?**
A: It works with mine.  Check Sierra's website to make sure it's the right fit for your motor.

**Q: Do they make a shorter version of the 18-7866?**
A: Yes you can use the 18-7944 or the 18-7945

**Q: Can this be used instead of 18-7846**
A: No, they are different size filters

## Customer Reviews

### ⭐⭐⭐⭐⭐ great product
*by T***R on January 6, 2026*

as described, good product, i've been using this brand filter for a long time and have had no issues

### ⭐⭐⭐⭐⭐ It works great
*by D***T on August 31, 2025*

Installed into an existing base, prefilled the filter then ran several gallons of fuel through thru. I collected a sample in a clear clean glass jar and sealed the jar. I’ve watched this jar for about two weeks, no debris or indication of contamination of any sort. Prior to this fuel/water seperator I had been experiencing poor outboard performance that has now gone away.

### ⭐⭐⭐⭐⭐ Sierra Marine fuel filter
*by N***N on June 27, 2025*

Great product, great price, great service!

## Frequently Bought Together

- Sierra International 18-7866 10 Micron, High Capacity Fuel Water Separator Filter for Yamaha MAR-FUELF-IL-TR, Medium
- Yamaha Original OEM Yamalube Acc-GEARL-UB-QT Marine Lower Unit Gearcase Lube Yamalube OEM - 2 Quarts
- Yamaha New OEM Yamalube 4M 10W30 4-Stroke Outboard Marine Oil, LUB-10W30-FC-04

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-12*