Plastic Tohatsu Gas Tank repair

[tbodine88]

Nissan Outboard Gas Tank

I have had my West Wight Potter Frimi for 16 years. Recently her Nissan 5 hp motor started leaking Gas. So I went online to order a new one, I found the website for Nissan parts. But they didn't have any parts for my motor. After searching through the forums I found that Tohatsu actually made this motor. I also found that they had the tank, but they only had three, and it is discontinued, so when this one fails, I may not be able to get a new one.
So I am looking for suggestions on how to fix it. There were/are two problems with the tank.

1. The spout at the top is made of hard plastic. The threads on it break off, especially if one tightens it too much. Once this happens the lid will not stay on
2. The hose on the bottom cracked, which caused the leak. This hose is fused with the bottom of the tank, thus when it breaks, the easy fix is to buy another tank

Pictures can be seen here http://http://www.cactus.org/~tbodine/Sailing/GasTank/

[Greenhand]

Just shows how lazy I am: I would get the new tank and expect to be putting the problem solving off for another 15 years.