blcl-
Idle is approx 1200 pph./eng. Divide that by 60 (minutes) and it yields 20 lbs. per minute.
If each engine burned 100 lbs. per minute, that would be 6000 pph, and if all 4 were running, it would be 24,000 pph. (On the ground at idle? No way.) That's about what they burn at takeoff thrust.