Looks like a petro trailer. Fumes would be my guess.
I worked in the tank trailer business for 15 years. Our service shop steamed the living hell out of a petro tank, tested and sniffed for fumes, steam some more, test, steam, test, steam until there wasn't a fart molecule to be found.
This is tank service 101 and the LAWS are very clear. Somebody's in a heap of trouble for that disaster.
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Just not enough money for me to work on that kind of stuff....
just not worth it...
I get into enough trouble working on normal everyday things..
I once washed out a motorcycle tank thoroughly and was ready to start cutting into it but decided to give it flame test just to be sure. A roar like a jet engine and a ten foot flame out the filler is what i got.
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