On Sat, 22 Jun 2013 00:51:33 -0400, gfretwell wrote:

Federal law says gas cans have to be red. You can have an identical
yellow can for diesel and it is illegal to put gas in it.

I think that's only for transportation purposes.
What you do at home is up to you.

At least that's what the California CHP (800-835-5247) told me when
I had called them about laws regarding transporting 50 gallons of
gasoline in my trunk.