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Just a good time to check the in tank components for corrosion (the fuel level float especially). The double float aux fuel switch are notorious failure points, so take care in removing and replacing. Not much else going on back there from a preventative maintenance point of view past that...

Its absolutely possible to backblow the fuel drain to clear something up, but as its a gravity drain, whatever is displaced will simply end up back there. It might even be part of the well nut, FOD, you don't know. Compressed air never hurts as a step one to see if it helps get some of it out...

How much work you want to put in? The absolute best result is pulling the tank and pressure washing... but you need to pull the radiator and all metal above the tank to do that (as well as the items in the tank). Acetone or similar may do what you want, can take a plastic brush and stick your...

Or unhook the hard line at the primary pump and fab up a short hose from the outbound side of the pump, into the container of your choosing. No sense in recreating the wheel. The tank is HDPE or similar.

I read it that hes trying to drain the tank bulkhead.

Might be plugged by mud wasps... not uncommon. Got anything small you can run into the drain line? Its just a bulkhead fitting that goes behind the battery and to the drain plug on the tank. Could be trash in your tank too, that has settled onto the backside of the fitting in the tank...