is fluid burner generator for oil? i also have angels mods (excluding the decoration ones)
It can burn and fluid with a fuel value. (Point to a pipe or storage tank, and where on the lower right hand side of the screen where it brings up information about a fluid, next to/under temperature, if it has a fuel value, it will be displayed here) This includes some things, such as Hydrogen, that Angels mods may remove the fuel value from, if that's the case, you can't burn it. (It used to be named the Oil generator, but was renamed because it can burn more than just oil)
I'm not entirely sure what angel removes fuel values from, but you should be able to burn all the oil products.