Hmmm, very interesting. You may be right about that being a fuel line......
That crusty thing sort of reminds me of something on the old 740/940 Regina fuel systems (single high pressure pump in the fuel tank). It was mounted in the fuel line just above the in-tank pump and it's purpose was to buffer the fuel pump pressure pulsation:
https://www.brickboard.com/FAQ/700-900/ImagesProcedures/Images-ReginaFuelPumpReplacement/regina26.jpg
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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