Personally, I do not give a shit about a pump. About the only thing it is good for is stroking the ego IMHO. It is much more important, for me, to progress on the major compounds in some way such as weight, reps, etc.
You can get a hell of a pump off of curling a 20lb dumbbell 20-30 times
and not grow at all whereas you can concentrate on the compound movements, ignore the isolations and add inches to your arm (as an example).
The pump is a horrible way to determine the effectiveness of any particular routine. Off my soapbox.