liquid (gas) cools the fuel pump...
The fuel in the tank cools the pump, it's not necessarily because of the fluid resistance.
The reason you don't rev an engine without a load is because it revs and drops rpm's way faster than it was designed. The load forces the engine to accelerate/decelorate slower. So it's more like a sudden acceleration and stopping causing the added stress.
I'm also sure there is also an issue with oil and coolant not being able to lubricate/cool critical engine components fast enough to keep up with the unloaded revving.
Point well taken, but it's hard to believe that any liquid here in Arizona cools anything! :nogrinner
2011 V6 3.7, 3.55 gears, Pony Pkg, Kona Blue, JLT CAI box & cone w/MMR CAI tube. Magnaflow perf/st axle-backs & MF uni x-pipe w/fab mid-pipes. BMR Shortys & 73mm? throttle body w/matching spacer. Whiteline SOLID front & rear sway-bars. Heat shield manifold to eng. Accel coils w/Pulstar plugs. 4 bolts ea side strut tower brace. Have SCT tuner w/91S, 91P, 91R BAMA tunes. Currently using Diablosport Trinity 1000 w/91 octane Dyno-Tune . Soon BMC Black Mamba carbon fiber hood.