Outboard Fuel Line 10mm 3/8in 1.83m Primer Bulb USCG B2 MMS-3275B
mms-3275beta
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10mm Outboard Fuel Line Assembly
1.83m hose with primer bulb and clamps
A complete 10 mm (3/8 in) low-pressure fuel-feed hose assembly for portable-tank outboard installations. The primer bulb contains a one-way valve to draw fuel from the tank towards the engine; fuel connectors are not supplied.
Key Features
- 1.83 m (6 ft) fuel hose assembly
- 10 mm (3/8 in) internal hose size
- Primer bulb with moulded flow-direction arrow
- Stainless-steel hose clamps included
- Tank and engine quick-connect fittings are not included
Technical Specs
| Hose ID | 10 mm (3/8 in) |
| Length | 1.83 m (6 ft) |
| Hose marking | USCG Type B2 / SAE J1527 |
| Fuel flow | Tank → primer bulb arrow → engine |
| Included | Hose, primer bulb and clamps |
| 4Boats SKU | mms-3275beta |
Compatibility / Fitment Guide
Suitable installation: an above-deck or portable-tank, low-pressure petrol feed where both hose tails accept 10 mm (3/8 in) ID hose. Select separate tank-end and engine-end connectors to match the actual fittings on the boat.
| Before ordering | Measure the hose-tail outside diameter; it must suit 10 mm ID hose. Confirm the required 1.83 m route without stretching, kinking or sharp bends. |
| Installation | Point the arrow on the primer bulb towards the engine. Support the line clear of hot surfaces, moving controls, batteries and abrasion points; clamp every hose-tail connection. |
| USCG B2 limitation | Type B hose is not fire-resistant. Do not use this assembly in an enclosed petrol-engine compartment or another location that requires Type A fire-resistant hose. |
| Low-permeation claim | Only describe the hose as B2-15 / low-permeation if “B2-15” is physically printed on the supplied hose. A plain B2 marking does not establish the -15 rating. |
| Not suitable for | High-pressure EFI delivery circuits, diesel systems, permanent below-deck runs requiring a different hose class, or fittings sized for 6 mm / 8 mm hose. |
Part Number Cross Reference
| Hose standard reference | USCG Type B2 / SAE J1527 |
| Size reference | 10 mm / 3/8 in ID |
| 4Boats SKU | mms-3275beta |
No OEM engine connector is included; matching is by hose diameter, hose marking and the separate connector interfaces.
Frequently Asked Questions
Does this fit every outboard?
No. It fits low-pressure systems using 10 mm hose tails and separately selected connectors.
Is it B2-15 low-permeation hose?
Only if B2-15 is printed on the actual hose. The B2 designation alone is not the same claim.
Which way does the bulb face?
The moulded arrow points from the fuel tank towards the engine.
Are connectors included?
No. The assembly includes hose, primer bulb and clamps only.
Inspect the hose, bulb, clamps and connectors for softening, cracks or leaks before every use. Replace damaged fuel-system parts immediately.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
