T-H Marine Yamaha Outboard Fuel Tank Connector, 1/4 NPT

If you run a Yamaha outboard off a portable or remote fuel tank, the connector at the tank is the small part that makes the whole fuel system work. This is the T-H Marine replacement for that fitting. It's a male 1/4 inch NPT threaded connector built to replace Yamaha OEM part number 470YMC. When the original cracks, weeps, or just won't seal anymore, this is the piece that gets you back to a clean, tight connection between the tank and the fuel line.

Here's what it actually does. The connector threads into the fuel withdraw port on your tank. The male 1/4 inch NPT threads bite into the tank fitting, and your fuel line coupler attaches to the other end. That's the handoff point between the tank and the engine. When it leaks, you get a fuel smell in the locker, air pulled into the line, and an outboard that starves and stumbles under load. A tight connection right here matters more than most folks realize.

Fuel fittings don't last forever. Today's ethanol blends, sun, and years of connect and disconnect cycles harden the seals and wear down the threads. If you're chasing a hard-starting Yamaha, an engine that dies when you push the throttle, or a tank that reeks of gas after it sits, a tired connector is a common culprit. Swapping it is a cheap fix compared to tearing into the fuel pump or the carbs looking for a problem that started at the tank.

Installation is straightforward for most owners. Back the old connector out of the tank fitting, wipe the threads clean, and thread the new one in by hand to start. Because these are tapered NPT threads, you'll want a fuel-rated thread sealant on the male threads to get a proper, leak-free seal. Snug it down with a wrench, but don't gorilla it. Then reconnect your fuel line and check for leaks before you leave the dock. It's a ten-minute job with basic tools.

So who's this for? It's for Yamaha outboard owners running a remote or portable tank that uses the 470YMC-style connector. Center consoles, bay boats, skiffs, jon boats, tenders, and kicker-motor rigs all lean on this kind of fitting. If your current connector matches this thread size and OEM reference, the new one drops right in. Not sure? Pull your old fitting and check the OEM number against 470YMC before you order, and confirm the thread is a 1/4 inch NPT male.

One thing to be clear about. This is the connector only. It doesn't come with a fuel hose, a primer bulb, a tank, or the mating coupler. If the hose-side fitting on your line is also worn out, you'll want to replace that too, but that's a separate part from this one. Buying just the tank connector keeps your cost down when that's the only piece that has actually failed, which is often the case.

A quick word on fuel safety, because it's worth it. Any connection in a marine fuel system needs to be sealed and checked. After you install the connector, prime the system and look and smell for leaks before you start the engine. Give it another look after your first run. Gasoline vapor in an enclosed space is no joke, so take the extra two minutes. If you spot weeping at the threads later on, back the fitting out, add fresh sealant, and reseat it rather than cranking harder on a fitting that's already snug.

T-H Marine has built rigging and fuel-system hardware for boats for a long time, and this connector is a like-for-like replacement you can count on to seal and hold. If you run a Yamaha off a portable tank, it's worth keeping a spare in the parts box. It's the kind of small, easy-to-overlook fitting that strands you at the worst possible time, and having one on hand is cheap insurance for a good day on the water.