I have a chance to buy one of those used Mercedes Benz accessory metal gas cans that sometimes show up for sale.

They are not so cheap, being in Germany (the Mercedes Benz classic center won't sell them, new, as they are cracking down hard on DOT prohibited euro parts, and this is one)

My question, is this: If they go unused for some time, is there some danger that rust flakes come off INSIDE, making them an unwise purchase, on the idea that if you ever finally needed them, that the gasoline you put into them could become contaminated with rust flakes and cause mischief to the engine and fuel system?

It is an interesting accessory, 100% impossible to buy easily, as a new item.

Should I get it?

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)