Was not too bad to get off, bit of grazed knuckles and profanity.
The pickup tube for fuel has a rotted screen filter. I have enquired with a couple of suppliers to see if a suitable gauze is available as well as asking for advice! Today I ordered a submersible diesel pump, I prey it will go through one of the castings ports so I can drop it through in the future to clean the fuel on a as required basis. This and the clean up I’ll do with the tank cap off will ensure the supply is clean; the uplift tube has a saucer affair at the end to stop suction direct from the bottom of the tank.
So, on balance I’ll try elbow grease to clean the casting, maybe treat with a krust type product and paint, remove the rotted gauze and refit. Probably new npdm Cork gasket. Maybe I could find a replacement for the 90 degree filler elbow, the tube reinforced pvc tube from the deck fitting is clamped onto a threaded pipe. Perhaps I can do better, a female brass hose tail? More later..