Brought this 262C out of an 11 year slumber today. B21FT/M46
Drained the oil and gas; removed and tested the pumps; replaced the strainer and eventually the main filter (wanted it to catch the last bits of big crud in the lines); ran a mix of Marvel Mystery Oil, Seafoam and 4 gallons fresh fuel (took that many until it started coming out of the lines clear enough) & added some fresh oil and sea foam in the crank case. (Second picture is inside the container I drained the old gas into)
Real test will be tomorrow running it for an extended time but so far so good.