PRODUCT DETAILS
Water in Fuel / Water Separator Sensor for Mercury & Mariner Outboards
Marine-grade aftermarket water-in-fuel (WIF) sensor for selected Mercury and Mariner outboards.
The sensor detects water contamination in the fuel system / water-separating fuel filter and allows the engine monitoring system to provide a warning.
Replaces Mercury 889330 / 8M0021043.
Fitment
Fits selected Mercury / Mariner applications including:
DFI / OptiMax
-
75 HP
-
80 Jet
-
90 HP
-
115 HP
-
115 Pro XS
-
125 HP
-
200 HP
-
225 HP
-
250 HP
4-Stroke EFI
Selected:
-
65 HP
-
75 HP
-
80 HP
-
90 HP
-
100 HP
-
115 HP
-
135 HP
-
150 HP
Verado
Selected:
-
135 HP
-
150 HP
-
175 HP
-
200 HP
-
225 HP
-
250 HP
-
275 HP
-
300 HP
-
350 HP
-
400 HP
Also used on selected Mercury Racing and Zeus applications.
Replaces Mercury Part Numbers
-
889330
-
8M0021043
Current Mercury Supersession
-
8M0214989
Mercury 889330 was superseded by 8M0021043, which has subsequently been superseded by 8M0214989.
The latest replacement may look different from the original sensor but is listed as the functional replacement.
Additional Cross References
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Sierra 18-7606
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MAR-10171-30-00
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AM8M0021043
Product Function
This sensor is fitted to applicable water-separating fuel filter / vapor separator systems.
It monitors for the presence of water in the fuel and sends the appropriate signal to the engine monitoring system.
A water-in-fuel warning should be investigated promptly, as contaminated fuel can cause poor running and damage to fuel-system components.
Product Features
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Water-in-fuel sensor
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Fuel & water sensor
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Water separator sensor
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Mercury / Mariner applications
-
Selected DFI / OptiMax
-
Selected 4-Stroke EFI
-
Selected Verado
-
Marine-grade aftermarket replacement
-
New
What's Included
1 × Water in Fuel Sensor
⚠️ Important Compatibility Warning
This sensor does NOT fit every Mercury / Mariner engine within the horsepower or year ranges listed.
Please check:
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Original sensor part number
-
Engine horsepower
-
Engine model
-
Complete serial number
-
Electrical connector
-
Fuel filter / vapor separator configuration
If the part looks the same as yours, this does not always mean it is the correct part for your outboard.
If unsure, send SSI Marine your engine horsepower + complete serial number + original sensor number and we will help check compatibility.
Buyer Responsibility
It is the buyer's responsibility to confirm compatibility before purchasing.
OEM part numbers are used for identification and reference purposes only.
Why Buy From SSI Marine?
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Marine-grade aftermarket & OEM-spec parts
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Workshop-tested products
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More than 10 years supplying outboard parts
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Same-day dispatch before 1 PM Monday–Friday
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Royal Mail Tracked 24
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UK stock
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Collection from Leigh, Greater Manchester
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Technical support from experienced outboard specialists
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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