as long as its not a trash pump,you should have lots of suction with a 2.5 i own a 3.5 honda wh-15 pressure model,used it on a keene 2inch dredge.just above idle would outperform the stock 2stroke weedeater pump.am now using same pump to run a 2.5inch combo(g-1) just about half throttle is plenty for that.hope this helps.