Fuel Pump Diaphragm Tohatsu 9.9-50hp 350-04005-0 Mercury 853731 2 Mariner 15hp
350-04005-0
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PUMP DIAPHRAGM 350-04005-0
Fits Tohatsu, Nissan & Mercury Mariner Outboards
This precision-engineered fuel pump diaphragm is a critical component for maintaining the consistent fuel delivery required by your outboard engine. Designed to withstand the rigorous demands of marine environments, it ensures your pump operates at peak efficiency by accurately translating crankcase pressure pulses into fuel flow.
Key Features
- ✔ Direct fit for Tohatsu & Mercury pumps
- ✔ High-grade reinforced rubber compound
- ✔ Chemical resistant to modern ethanol fuels
- ✔ Essential for resolving fuel starvation
Technical Specs
| Part Number: | 350-04005-0 |
| Material: | Viton/Nitrile Rubber |
| Temp Range: | Up to 105°C |
| Origin: | Tohatsu OEM / Quality AM |
Compatibility / Fitment Guide
| Make/System | Model/Application | Notes |
|---|---|---|
| Tohatsu / Nissan | 9.9HP, 15HP, 18HP, 40HP, 50HP | 2-Stroke Models (M/NS) |
| Mercury / Mariner | 9.9HP, 15HP, 18HP, 40HP, 50HP | International Japanese Models |
| Tohatsu 4-Stroke | MFS2.5A, MFS3.5A, MFS5A, MFS6A, MFS8A | Select small HP 4-stroke units |
OEM Cross Reference
| Tohatsu/Nissan: | 350-04005-0, 3C8-04005-0, 350040050M |
| Mercury / Mariner: | 853731 2, 8537312, 853731 1 |
| Sierra Marine: | 18-7798 (Kit component) |
Questions & Answers
Is this a genuine original part?
This part is sourced as either a genuine Tohatsu OEM component or a premium quality aftermarket equivalent designed to match OEM performance. It is supplied through 4boats.co.uk UK stock.
How do I know if it is compatible?
Check your engine serial number. This part is widely used on Japanese-built Mercury models and Tohatsu 2-strokes. If your current diaphragm matches part number 350-04005-0 or 853731 2, this is the correct replacement.
What are the symptoms of a failing diaphragm?
Common signs include the engine losing power at high RPMs, difficulty starting, or the engine stalling shortly after starting as the fuel bowl runs dry due to poor pump pressure.
Note: Please verify your original part number against the references above before purchasing. Distributed by 4boats.co.uk.
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