I'll always put it off and see if Startron kills all the Fungus [First!]

Nah, you run the fuel level down as low as you dare...take the fuel return line
and place it into a 5 gallon container...let the engine's fuel return function
drain the Tank until the engine stops.
Then the fun. The tank Strainer is UNDERNEATH the Fuel tank and takes a 46mm
wrench
(Sometimes you get lucky IF you're Very,Very careful with Channel Locks.)
Be prepared for a minor Diesel Bath when you remove the Strainer.

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'84 300SD sold
124.128