What temp is typical summer D2 good to?

[velociT]

Ok, I know that fuel differs alot... so I'm saying your average summer ULSD D2 fuel is good to around what temperature if left untreated by an anti-gel additive?

 

[OilGuy]

+20 F is the cloud point number I always keep in my head. Might be a couple degrees warmer or so depending the the fuel.

 

[tdidieselbobny]

Good thing for me to remember-I forgot about the fuel in my mower and the clear inline filter looks like gel-the tank is liquid still-guess it's time to break a heater out and do a thaw and treat fuel......

 

[TornadoRed]

Ok, I know that fuel differs alot... so I'm saying your average summer ULSD D2 fuel is good to around what temperature if left untreated by an anti-gel additive?

Cloud point is around 40°F, pour point around 15-20°F.

To quote from Lug Nut:
"There are generally three temperatures to be considered when discussing winter use of diesel fuel. These are, in descending order: the cloud point, the cold filter plug point and the gel point.

The cloud point is the temperature at which the fuel begins to change state. The change increases the opacity as longer chain molecules in the fuel begin to stiffen and knit or intertwine.

The CFPP is dependent on the size of the filtration media. Coarser media (or a new filter) will obviously have a lower CFPP than a sub-micron filter (or a used filter). There is some test standard that I do not know specifying the size of the media and the flow rate of the fuel used to calculate the CFPP.

The gel point is the temperature at which the fuel is for all intents and purposes a solid."

 

[OilGuy]

Iowa State info on petro and bio
http://www3.me.iastate.edu/biodiesel/Pages/biodiesel16.html

Mobil's diesel fuel data sheet:
http://www.mobil.com/USA-English/GFM/PDS/GLXXENCMFMODiesel_On_Road.asp

 

[TornadoRed]

Iowa State info on petro and bio
http://www3.me.iastate.edu/biodiesel/Pages/biodiesel16.html

Pretty good summary. Gel point is not defined.