I've got a couple issues with the Beaver/R985 I'm flying right now.

1) Every once in a while the generator won't charge the battery. I haven't seen it quit during flight, it just won't commence charging from start on a given flight. Cycling everything doesn't fix it. I will leave it overnight and the next day it will function normally and carry on for an other 20 legs or so.

2) Sometimes after a hot start there will be no fuel pressure at taxi RPM. Only after start though, never at taxi RPM after landing.

I've encountered this on a beaver before. Low fuel pressure light coming on when hot. I've been told it could be. Sign the fuel pump is starting to go

this is just a hunch re fuel pressure issue , check the lines and seals for leaks to carb also the engine fuel pump . as you mentioned that taxi after start , low pressure but not after landing where there would likely be enough fuel in collection points . one other point may be is the wobble pump seals may be allowing fuel to flow back due to worn piston or seals with the moose haul season coming good to get it checked you dont want to be doing the what if on some short lake with of moose n weather closing in.