My lite had a problem like this, it would pump water but it was pathetic.
Took it back to the dealer and had them find and fix the problem, turned out it was a loose connection at the intake side of the pump it was sucking as much air as water.
Pass thru door to the left of docking station.
Inside right side of the pass thru is a panel, 4 #2 Robertson screws need to be removed.
Pump is right there.
I figure 1 to 1 1/2 hours with a beer break to replace.