As 742 said, there are different engines out there, and they have different instrumentation.
On glide slope for a thirty flap mid-weight landing, try starting at 6,000 lb fuel flow per engine, (24,000 total). Flaps 25 would take about 5,000, (20,000 total).
For less that all engines, use the same total fuel flow for the flap setting, so, flaps 30 three engine approach would use 8,000/engine, again 24,000 total.
Joe