Quote Originally Posted by PaulR View Post
Sounds like a fault to me - there is a release valve that will not allow overpressure, you can hear it hiss on the third pump - seems like yours releases too much.

You could try slowly and surely compressing the third stroke - the temptation is to slam it back because the resistance is greater with each stroke and maybe this causes the valve to react.
Agreed. The release valve definitely activates on the third pump, but it does so regardless of how quickly you close the top cover.

I'm not bothered by this. Most of my shooting is done with just the one pump anyway, and 5.5 FPE from just two is plenty extra for those times when I want to shoot a little further or knock down targets with a bit more inertia.