From Brown-Driver-Briggs' Hebrew Definitions:
אכל
1. to eat, devour, burn up, feed
a. (Qal)
1. to eat (human subject)
2. to eat, devour (of beasts and birds)
3. to devour, consume (of fire)
4. to devour, slay (of sword)
5. to devour, consume, destroy (inanimate subjects - ie, pestilence, drought)
6. to devour (of oppression)
b. (Niphal)
1. to be eaten (by men)
2. to be devoured, consumed (of fire)
3. to be wasted, destroyed (of flesh)
c. (Pual)
1. to cause to eat, feed with
2. to cause to devour
d. (Hiphil)
1. to feed
2. to cause to eat
e. (Piel)
1. consume
Gesenius' Lexicon - H398
This is the Hebrew word used for 'consuming'...
Brown-Driver-Briggs' Hebrew Definitions
אשׁ
1. fire
a. fire, flames
b. supernatural fire (accompanying theophany)
c. fire (for cooking, roasting, parching)
d. altar-fire
e. God's anger (fig.)
Gesenius' Lexicon - H784
Hebrew word used for 'fire'...
Who said anything about the LXX? Not I. I use the NIV, KJV, YLT, and I also use the Greek and Hebrew Interlinears by Jay P. Green, Sr. I usually quote the NIV, but I use other translations too. You use the antiquated KJV. Forsooth?
You still are displaying a schizophrenic God. God deals with the sins of the Jews in the same manner he does the Gentiles now. Those who Christ never suffered for, will be consumed by God as He casts them into the lake of fire.
http://studybible.info/IHOT/Deuteronomy 4