By Bill Kleiman

I have seen this issue before.  A repair tag on the Birchmeier that says “does not pump right”  or “does not spray right”.  Indeed, when I tried this pack it would only pump one stroke and then the handle seemed stiff with pressure.  When I sprayed it the fluid came out fast but pressure faded immediately. 

I know what this is! 

The air bladder is full of basal bark liquid. I am pointing to the air bladder. To get it out you empty the tank.  Then rotate off the air bladder…but watch out because it will start to empty with a slow gurgle and a rush if you fully unscrew the bladder.  I used a funnel over a 2 gallon jug to catch it.  Screwed bladder back on it worked perfect.

How did air bladder get full of liquid?  If a pack falls over in a truck the air in bladder can move into the tank and the liquid in the tank move into the bladder.   So affix your packs so they don’t fall over.