For All Mankind season 1

[watervole]

 I've just finished the first season of 'For All Mankind'.  Enjoyed it, but I'm puzzled by the season finale.

 

How did Ed manage to get upto the Apollo module and down to the moon again?  And then up again!  

 

Surely there's no way salvaged fuel could power two lunar take-offs, let alone give the course correction for the Apollo module as well?

 

and the way lunar landers worked was for the base part to be left on the moon, in any case.