In all fairness to it being a tricky issue would you not feel more secure with taking the tank to a gas tank repair facility and having them do it? Your having to remove it anyway so this way they can go and clean it while checking for other problems....
I say this more in light of you don't get very many opportunities to remove the gas tank because of the necessity to remove the engine that you may as well leave it in the hands of people who do it for a living... If you do it wrong what a hassle it is to go back and fix...
Just my thoughts....
Dave
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.