Oil & Fuel HELP - Diesel Drain or not (Sta-Bil)

john_bud · Feb 19, 2009

Diesel is less volatile than gasoline and does not usually NEED it. No harm adding it. I do.

jb

smfcpacfp · Feb 19, 2009

If you are really worried, add a bit more diesel as you use up the existing fuel to thin it out a bit.

techman · Feb 19, 2009

As stated, diesel is very stable over time and usually does not need any additives. The two issues that can occur is water and biologicals. Water can start to accumulate due to condensate in the tank from weather changes. A bit of moisture can enter through the breather and later condense in the fuel. This will eventually create a small puddle in the tank. This is generally separated by the fuel filter. However the accumulation of water in the tractor's tank would take a very long time (years) if the cap is not opened. Not a worry.

With long term diesel storage the biggest factor is biologicals (fungus and bacteria) growing in the fuel. Again a very long term matter, and normally when the tank is vented to atmosphere. This usually occurs in tanks for standby generators that can sit for years. There are additives to combat the growth, but again I would not be concerned.

If you are just worrying about a season of non use, just keep the cap tightly closed. A full tank will also limit the volume of air which can introduce a bit of moisture.

paul

RobJ · Feb 19, 2009

Personally I would feel guilty putting any of this crap in my fuel. IMO it's a waste of good money. If something is going to sit that long, drain the tank and run it dry. Put that gas in the car. If something is going to sit longer, don't buy it...rent it next time!

My L has a water separator, in 3 years, generally only used every other weekend after sitting in a garage, I think I've gotten a teaspoon of water. My filter has a clear bowl so I can see the water.

jimainiac · Feb 20, 2009

Like others have said, no harm done, but I you'll get better results with a product specially made for diesels, like Power Service. You problably don't get cold enough to need the anti-gelling properties, but absorbing moisture and boosting the C-tane rating are good reasons for using it. Plenty of people will debate the usefullness of these products, but it gives me more peace of mind to use them. Guess that's worth something...