PRODUCT DETAILS
Mercury / Mariner 35–70 HP Outboard Fuel Pump Diaphragm Repair Kit – 2-Stroke
Quality aftermarket fuel pump diaphragm repair kit for selected Mercury and Mariner 35 HP, 50 HP, 60 HP and 70 HP 2-stroke outboard engines, replacing OEM part number 55278A4.
Designed to service compatible mechanical fuel pump assemblies, helping restore reliable fuel delivery when the original diaphragm or gaskets become worn, damaged or deteriorated.
Mercury / Mariner Outboard Fitment
| HP | Engine Application | Approximate Years |
|---|---|---|
| 35 HP | 2-cylinder Mercury / Mariner | 1984–1990 |
| 50 HP | 3-cylinder Mercury / Mariner | 1984–1990 |
| 60 HP | 3-cylinder Mercury / Mariner | 1984–1990 |
| 70 HP | 3-cylinder Mercury / Mariner | 1977–1983 |
Engine Type: 2-Stroke
Important: Not all engines within these horsepower ranges use this diaphragm kit. Compatibility depends on the original fuel pump assembly and engine serial number.
European / Belgian Serial Number References
| HP | Serial Number Range |
|---|---|
| 35 HP | 9384476 onwards, selected engines |
| 50 HP | 9385911–9469199 |
| 60 HP | 9385911–9469199 |
| 70 HP | 9135825–9385910 |
Mercury / Mariner OEM Replacement Part Numbers
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55278A4
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55278A3 – Earlier reference
Aftermarket Cross-References
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Recmar: REC55278A4
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Sierra: 18-7809
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GLM: 40340
Product Details
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Condition: New
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Quality: Marine-grade aftermarket
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Product: Fuel Pump Diaphragm Repair Kit
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Engine Type: 2-Stroke
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Application: Selected Mercury / Mariner 35–70 HP outboards
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Main OEM Reference: 55278A4
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Quantity: 1 × Fuel Pump Diaphragm Kit
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Stock: UK stock, ready for dispatch
Kit Contents
Replacement fuel pump diaphragm and associated sealing components for the compatible mechanical fuel pump assembly.
Please refer to the product photographs for the exact components supplied. Aftermarket kit contents may vary by manufacturer.
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 part number before ordering.
Different fuel pump designs were fitted across these engines, including square and other pump configurations that may require a different repair kit.
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?
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Workshop-tested genuine and aftermarket outboard parts
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Over 10,000 genuine and aftermarket marine parts stocked in the UK
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Same-day dispatch before 1 PM Monday–Friday
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Royal Mail Tracked 24 UK delivery
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Collection available from Leigh, Greater Manchester
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Technical support from experienced marine engineers
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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.
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