[RalphVa]

I buy diesel in three 5 gallon containers at a time. They last a little over 30 hours, about 1/3 year.

I had a diesel car stored for 6 months once. Came home, brought the battery up from the garage, put in car, glowed it, and it started instantly. No problems whatsoever.

Next time, diesel car was stored for 4 1/2 years. Diesel was a tad brown but no fungi. Had to use Chevron Techron to stop the constant speed pinging. Had to do this when I bought the car at one year old on the showroom floor. About a year or so later, the valves had to be ground. Don't think it was due to the fuel. Likely, one valve got a rust spot on it from sitting and now being started. They were supposed to have started it once/month, but the battery came back stone dead. They hadn't been doing it.

Think you only get the fungi if you get some water in the fuel.

Ralph