You never know. I had a problem once 4-5 years ago with kero from a local hardware store that has an above ground tank. After that I bought a Mr. Funnel and add algaeside to each batch I buy.

I now buy from a local gas station that has a pretty high volume business. I always buy from the same station and have yet to find any contamination in the Mr Funnel.

The best advise is to get a Mr. Funnel and always buy it from the same station (unless you have a bad experience there).

Joe