ORIGINAL: Cyberwolf
where both the fuel and plane are going at the same rate of decent if the fuel is at the back of the tank I''m sure it will stay there. Inertia will take over gravity any day of the week.
Here's an experiment for you to try. Jump out of a plane carrying a jar full of fuel (you could use water but let's stay with fuel

) and watch what happens to that fuel when you reach terminal velocity as a model does when it's in a dive. Don't forget to pull the rip cord if you want to report the results to us