[allaircooled]

Originally Posted by E Sully

Don't use any coatings inside the gas tanks after 1973.5, it can peel off the whirl pot and clogg the lines.
http://forums.pelicanparts.com/porsche-911-technical-forum/768320-cis-gas-tank.html

This is one of the reasons why I had to replace mine. Besides leaking, previous owner coated the inside with something and it started flaking off.