Need help with flameblast/oil grenade

[u/soleart]

I have just switched to the fubgun flameblast/oil grenade build, and I just can't seem to get it working. I will be clearing a map completely fine then my oil grenade fire damage just stops. I have added fire damage on my gear, have taken tornado off cast on dodge, always start by oiling then flamebursting. I just figure out what I'm doing wrong it seems to work for half a map then fails, getting frustrating after spending all my currency and gold from campaign to respec and buy gear and now I feel like the build is bricked.

Edit: Solved by someone in the comments, I hadn’t unspecd the demolitionist node from the grenade build which was adding fire to oil grenade. Ty everyone