Presuming you’re attempting to make a gasoline spreader then you can simply omit the “container” entry and it’ll work just fine.
Alternatively, you could do what I did with the blobtillery.
"use_action": {
"type": "explosion",
"sound_volume": 0,
"sound_msg": "Splish.",
"no_deactivate_msg": "Oh look, gas.",
"explosion": {
"power" : 10,
"shrapnel" : {
"count" : 100,
"mass" : 1,
"recovery" : 100,
"drop" : "gasoline"
Of course, in this case, power of the explosion affects both range and damage; and distance factor can only be less than 1. So that may not be what you’re looking for.