PRODUCT DETAILS
Mercury / Mariner 75–85 HP Outboard Fuel Pump Diaphragm Repair Kit – 2-Stroke
Quality aftermarket fuel pump diaphragm repair kit for selected Mercury and Mariner 75 HP, 80 HP and 85 HP 4-cylinder 2-stroke outboard engines, replacing OEM part number 55278A5.
Designed to service compatible triangular mechanical fuel pump assemblies, replacing worn or damaged diaphragm and sealing components to help restore reliable fuel delivery.
Mercury / Mariner Outboard Fitment
| HP | Engine Application | Approximate Years |
|---|---|---|
| 75 HP | Selected 4-cylinder 2-stroke engines | 1984–1988 |
| 80 HP | Selected 4-cylinder 2-stroke engines | 1978–1983 |
| 85 HP | Selected 4-cylinder 2-stroke engines | 1973–1977 |
Serial Number References
| HP | Serial Number |
|---|---|
| 75 HP | USA 6432901 onwards |
| 75 HP | Belgium 9393856 onwards |
| 75 HP | Canada 7208573 onwards |
| 80 HP | USA 4831999–6432900 |
| 85 HP | USA 3493913–4831998 |
Important: Suitable for selected engines with the triangular fuel pump. Engines fitted with a square or alternative fuel pump assembly may require a different repair kit.
Mercury / Mariner OEM Replacement Part Numbers
-
55278A5
-
55278A2 – Earlier cross-reference
Aftermarket Cross-References
-
Recmar: REC55278A5
-
Sierra: 18-7808
-
GLM: 40330
-
Mallory: 9-37750
Product Details
-
Condition: New
-
Quality: Marine-grade aftermarket
-
Product: Fuel Pump Diaphragm Repair Kit
-
Engine Type: 2-Stroke
-
Application: Selected Mercury / Mariner 75–85 HP 4-cylinder outboards
-
Fuel Pump Type: Triangular mechanical fuel pump
-
Main OEM Reference: 55278A5
-
Quantity: 1 × Fuel Pump Diaphragm Kit
-
Stock: UK stock, ready for dispatch
Kit Contents
Replacement diaphragm and associated gaskets and seals for the compatible mechanical fuel pump.
Please refer to the product photographs for the exact components supplied. Contents may vary between aftermarket manufacturers.
This listing is for the diaphragm repair kit only, not a complete fuel pump assembly.
OEM part numbers are used for identification purposes only.
Important – Check Compatibility
Please confirm your Mercury / Mariner engine horsepower, cylinder configuration, serial number and original fuel pump design before ordering.
Different mechanical fuel pumps were fitted to these engines, and not all diaphragm repair kits are interchangeable.
If the parts look the same as yours, this does not always mean they are correct for your outboard.
If unsure, contact SSI Marine with your engine details before purchasing.
Why Buy From SSI Marine?
-
Workshop-tested genuine and aftermarket outboard parts
-
Over 10,000 genuine and aftermarket marine parts stocked in the UK
-
Same-day dispatch before 1 PM Monday–Friday
-
Royal Mail Tracked 24 UK delivery
-
Collection available from Leigh, Greater Manchester
-
Technical support from experienced marine engineers
-
10 years supplying the UK marine market
Buyer Responsibility: Please confirm compatibility before purchasing.
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £7: 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.
YOU MIGHT ALSO LIKE
OFFICIAL PARTNERS OF
