VEVOR Boat Fuel Tank, 3.17-Gallon/12-L Marine Outboard Transfer Tank, Transfer Tank with 9.8ft Hose, Gauge for Outboard Engine, Yacht, Fishing Boat, Deck, Red

If the connector of the Evinrude motor is the same as that of the Yamaha, the product can be used universally.

This can be be adapted to a Yamaha 9.9hp.

Yes, you can.

The dimensions of the product are: 14.4" x 11.6" x 10.2" / 365 x 295 x 260 mm.

The connector that fits the tank is a standard 1/4" NPT threaded fuel tank adapter, typically compatible with Yamaha-style two-prong quick-connect fittings. if this answer does not resolve the current issue, please contact us again for assistance.

Unaccustomed.