Ships that have the Boarding ability (by default, all Privateer and Crystal ships) usually board a ship when they try to tow it and it has no fuel. This friendly code on the towing ship prevents that. This way, Privateers and Crystals can tow friendly fuel-less ships without boarding them.

This is a testing version.
It may be incomplete, and have more bugs (or features) than the public live version at planetscentral.com.