411A............your answer is WRONG !
I've been there, I've seen it and I've done it - probably before you !
I've explained what actually happens, which has been agreed and supported by a number of similarly experienced and knowledgeable airmen.
Our experience makes sense............if you rotate a pump, the output varies according to rpm - remember physics at school ? RPM constant = Pressure Constant if nothing else changes.
411A, Re-read your Boyles and Charles Laws and fluid dynamics.