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1.
Derived from the days of Coal steamers, literally means to add more coal to the fire which would increase available engine power.

Used now-a-days by Pilots amongst others.
"Looks like we're coming in high, better pour the coals to her and overshoot!"
by Iwallis November 22, 2011
 
2.
An old saying from when ships were powered by coal fired boilers. When the captain wanted full speed he'd call down to the boiler room and the master stoker would call out for everyone to "Pour to coals to her" - literally to feed more coal to her (ships are always female). The saying became synonymous with “giving it your all” and to accelerate as fast as you can.
The liquor store closes in 15, better pour the coals to her!
by Goodbye_Charlie September 22, 2010