8mm 5/16 Outboard Fuel Primer Bulb One-Way Tohatsu Mercury Mariner
MMS-164
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Regular price£14.99
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8mm 5/16 Outboard Fuel Primer Bulb One-Way Tohatsu Mercury Mariner
Product reference: MMS-164
One-way marine fuel primer bulb for 8 mm hose systems
A replacement primer bulb for transferring fuel toward the outboard while helping prevent backflow. The 8 mm hose size is the key fitment check.
Key features
- For 8 mm (5/16 in) marine fuel hose
- One-way valve helps maintain fuel direction
- Ethanol-compatible marine-grade rubber construction
- Supplied with stainless-steel stepless clamps
- Suitable for many Tohatsu, Mercury and Mariner fuel-line systems
Specifications
| Product type | Outboard fuel primer bulb |
|---|---|
| Fuel hose size | 8 mm / 5/16 in |
| Valve | One-way |
| Bulb material | Marine-grade rubber |
| Clamps | Stainless-steel stepless clamps |
| Fuel compatibility | Petrol including ethanol-blended fuel |
Compatibility and application
Commonly used on Tohatsu, Mercury, Mariner and other outboards fitted with an 8 mm (5/16 in) fuel line. Brand names indicate typical application only, not universal engine fitment.
Check before ordering: Measure the internal diameter of the existing fuel hose and check the fuel-flow arrow during installation. Replace any hardened or cracked hose at the same time.
Frequently asked questions
Which fuel hose size does this bulb fit?
It is for 8 mm internal-diameter hose, also described as 5/16 in.
Is it limited to one outboard brand?
No. It is commonly used with Tohatsu, Mercury and Mariner systems, but hose size and connection type determine fitment.
Can it be used with ethanol-blended petrol?
Yes. The primer bulb material is specified as compatible with modern ethanol-blended petrol.
Which direction should it be installed?
Install it with the fuel-flow arrow pointing toward the engine and secure both hose connections correctly.
Supplied by 4Boats UK. Check the specification and compatibility information above before ordering.
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