[Spaceships] Query: Collapsible Fuel Tanks

[DaltonS]

I'm trying to locate the Official rules for using collapsible fuel tanks in cargo holds to store extra fuel. I've used them often in my ship designs but I'm beginning to wonder where the original specifications came from. I vaguely remember there was some sort of limit on the gravitational acceleration they could take when loaded but I can't remember what it was. On ships with Gravitic Compensators this isn't an issue but on more primitive vessels it might be. I just want to track down the source with book name and page number.

Dalton “who hates vague memories” Spence