11, 314 M4 3-4-3 Flame - for most of its service it was known as M4 E4-5 Flame - only from 4/45 a derivate of an auxiliary flamethrower E4-5 was standardized as M3-4-4 (Zaloga: "..many unit records refer to the various types of auxiliary flamethrowers under the generic E4-5 designation...")
Both units differ in number of FT shots 1 or 3, but this is hopelessly low, while USMC #205 M4 E4-5 Flame has 10 shots.
In fact it had 50 gallons and a burst time 50 sec (a comparison is here
http://forum.shrapnelgames.com/showthread.php?t=50474 ). Early ones might have been an early variant with 25 gals and 40 sec.
A Crocodile (#315) had 400 gals and 80 sec.
Also, same machines as USMC OOB #100 M3A1 Flame, with improvised infantry flamethrowers, were used in action by the US Army on Pacific theatre from 1/44.