Hihaha 5/16-inch Boat Fuel Connector Kit — Stainless Steel Male & Female with Locking Nut

Hihaha's 5/16" stainless-steel fuel connector kit provides a leak-resistant male and female adapter with locking nut to join 5/16" (8mm) fuel lines on compatible Tohatsu and Nissan outboard engines.

This compact connector set is engineered to replace worn fittings or to adapt fuel hose assemblies on 2- and 4-stroke outboard motors from 5 to 90 HP. It combines a male fitting, a female fitting with multiple barbs, an O‑ring seal and a separate locking nut so you can re-establish a secure, corrosion-resistant fuel connection between the tank, hose and engine. The components are suited to common Tohatsu and Nissan part shapes, but buyers should visually confirm fit before installation.

Will this fit my Tohatsu or Nissan outboard engine?

Compatibility covers many small to mid-size outboards from both manufacturers, including engines in the 5–90 HP range. Check the shape and barb count against your current fittings and confirm the hose inner diameter is 5/16" (8 mm).

• Fits engines like M50D2, M40D2, NS5B, NS70C and similar models.
• Designed for 2- and 4-stroke fuel systems using 5/16" (8 mm) hose.
• Visual match and part-number verification recommended before purchase.

How does the kit reduce fuel leaks and vibration issues?

The female side uses four barbs and the male side uses two barbs to grip the hose, while an O‑ring provides a pressure seal at the mating faces. The extra locking nut lets you secure the connection against vibration common in marine engines.

• O‑ring creates a primary seal at the mating interface.
• Four-barbed female fitting improves hose retention on the tank/engine side.
• Stainless-steel construction resists rusting in salty environments.
• Locking nut prevents the fitting from backing out under vibration.

What materials and parts are included in the package?

The set is made from stainless steel for corrosion resistance and includes the essential fittings to create a complete inline fuel connection. It arrives as a simple three-piece kit so you can swap parts quickly during routine maintenance.

• 1 x male fuel connector (engine side)
• 1 x female fuel connector (engine side) with 4 barbs
• 1 x stainless-steel locking nut
• Built-in O‑ring for leak prevention

How do I install this connector safely?

Turn off fuel supply, drain or clamp the line, then cut and slide the hose onto the appropriate barb side using marine-grade clamps or the supplied nut where applicable. Ensure the O‑ring is seated and test the system for leaks before returning to service.

• Work in a well-ventilated area away from open flame.
• Confirm hose inner diameter is 5/16" (8 mm) and cut squarely.
• Use hose clamps or the locking nut; torque hand-tight then test.
• Check for leaks under light pressure before operation.

Who is this for: This Hihaha connector kit is aimed at boat owners, technicians and DIY marine mechanics who need a durable, corrosion-resistant replacement fuel fitting for small to medium Tohatsu or Nissan outboards. It suits people doing routine maintenance, replacing cracked plastic fittings, or retrofitting older hoses to restore a secure, leak-resistant fuel connection without complex modifications.