fuel tank question 1972 w/ 2.0 d-jet, It is leaking but.... Options

[buck toenges]

If I put 2 gallons of fuel in my gas tank nothing leaks. When I put 12 gallons in it leaks. It drips from the bottom. I took out the tank and changed out the hoses from tank to ss fuel lines. I assumed I hadn't tighten the fuel hoses properly. I am using FI hose clamps. I even changed out a fuel pipe from the tank to make sure I had the bigger 9mm(10)mm fuel pipe on the one side of the fuel tank. When I put in 2 gallons no leaks. When I filled up the tank and drove for 20 minutes and parked I got a big gas puddle under the car.

Could I have a leak somewhere else on the fuel tank other then where the fuel hoses connect? Is there pressure from the FI system that may be pressurizing the tank too much? Any thoughts?

I am thinking about getting a new Dansk fuel tank. I see them listed as 1974-1976. Will they work for a '72 car? Who has the best price for these new repro tanks.

Thanks,
Buck