Mate, you got me there,
I live in Australia
Just make sure that any flexible lines are not blocked - free flowing
All I'm saying is that they can become blocked 'progressively ' over time!!
You should be sure that they are flowing as they should, and not restricted through 'swelling' and closing the 'hole' off......
I'm not familiar with your particular application , just be certain that your flexible lines are in good condition!!
Let know how u go!