Comment on Apollo Moon Landing Hoax – Scientific Evidence by Boner.
Fuel to the moon + fuel to land on the moon + fuel needed to leave the moon + fuel to return to earth = total fuel required.
The incident you are referring to is the landing. They came close to using up all of the fuel required for landing on the moon. Had they not landed when they did, they would have had to use some of the lift off fuel. And that would have been a problem. Though, the landing engine and the lift off engine were in two different sections so they probably weren’t even connected, fuel wise.