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Have a newer Cat pump-model# 4SF40GS1.It only puts out approx. 70% pressure and I can't figure out why.It has a Honda 13 HP DD,and has been winterized every fall.It runs fine and sounds normal,but simply does not have the power to give me 4 gpm at 2500 psi even,and it's rated for 3200 psi @ 4...