8mm 5/16 Outboard Fuel Primer Bulb Tohatsu Mercury Mariner
PRIMER-8MM
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Regular price£14.99
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8mm 5/16 Outboard Fuel Primer Bulb Tohatsu Mercury Mariner
One-way marine primer bulb for 8 mm / 5/16 in outboard petrol hose
A marine-grade hand primer with an internal one-way valve for fuel-line systems whose hose bore and installation direction match the specifications below.
Key features
- For 8 mm / 5/16 in marine fuel hose
- One-way valve helps prevent fuel backflow
- Ethanol-compatible marine-grade rubber
- Stainless-steel stepless clamps supplied
- Flow arrow identifies the required installation direction
Specifications
| Part type | Outboard fuel-line primer bulb |
|---|---|
| Typical engine brands | Tohatsu, Mercury, Mariner and other compatible outboards |
| Engine type | Petrol outboards using an external 8 mm fuel hose |
| Fuel hose bore | 8 mm / 5/16 in |
| Valve | Internal one-way valve |
| Bulb material | Marine-grade ethanol-compatible rubber |
| Clamps | Stainless-steel stepless clamps |
| Installation direction | Fuel-flow arrow points toward the engine |
Fitment basis
| Typical engine brands | Tohatsu, Mercury, Mariner and other petrol outboards |
|---|---|
| Model-year rule | Not applicable; universal only within the stated hose and fuel specification |
| Controlling size | 8 mm / 5/16 in fuel-hose internal diameter |
| Final checks | Hose condition, fuel compatibility, arrow direction and leak-free clamps |
Compatibility and application
A primer bulb is not selected by engine model or production year. The controlling dimensions are the fuel-hose internal diameter, connector style, permitted fuel formulation and flow direction. Brand names are typical applications only.
Check before ordering: Measure the internal diameter of the existing fuel hose; do not estimate from its outside diameter. Inspect the complete line for hardening or cracks, install the arrow toward the engine and leak-test all joints before use.
Frequently asked questions
Which hose size does it fit?
It is for 8 mm internal-diameter hose, also described as 5/16 in.
Is it limited to one engine brand?
No. Hose bore, fuel type and installation direction control fitment.
Can it be used with ethanol-blended petrol?
Yes, the bulb material is specified for modern ethanol-blended petrol.
Which way should it point?
Install the fuel-flow arrow toward the engine.
Supplied by 4Boats UK. Check the specification and compatibility information above before ordering.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
