Those five F-1 engines combined burned 15 tons of propellents per second.The turbo pumps feeding the engines were rated at over 50,000 hp. Much has been written about the voracious appetite of the Saturn V’s S-IC (first) stage engines: They could consume the propellant equivalent of a backyard swimming pool in 10 seconds. They could empty an Olympic-size swimming pool in about 2 ½ minutes. The liquid oxygen (LOX) alone is equivalent to 54 railroad tank cars.
It took a lot of hard work to solve the instability of combustion in the F-1s. It was finally resolved by a system of baffles on the injector plates.
Make that propellants.
Also had problems in longitudinal vibrations aka “POGO”
which caused damage to second stage (2 nd test launch in April 1968 had premature shutdown of engines in 2nd stage and failure of restart in 3rd stage caused by broken fuel lines)
Vibrations were so severe that could injure the crew
Threatened to derail the Apollo program - fix was found by using helium to dampen the vibrations