Display MoreSorry - didn't think to take any while I had it deployed.
It turns out it wasn't the "fuel" it was displaying (which would have been solid yellow if filled) but in that gauge was a bar that was red at the bottom and yellow at the top - not sure exactly what that indicates but it seemed like it was drawing power from the energy link. Once I added a bucket of fuel to the PetroGen, that bar was replaced by a bit of yellow and it began feeding power to the refinery (which went from blue to green).
Part of it may have been due to an initial pipe routing error - the output pipe was oriented from my fuel storage tank to the refinery at first, and I did not discover this until one of the oil input reservoirs filled with yellow instead of black. The bad news was, that was 4 buckets of fuel lost and a refinery operating at 50% capacity until I picked it up. But that may have something to do with why it took fuel from the system rather than supplying power.
If I can re-create they issue in the future, I'll provide screenshots. It will have to wait until I find another geyser or get to the point where I can make an OilFab or OilMat on this world.
I don't need a screenshot of it actually running, just a picture of the setup you are referring to. I don't see anything called an "energy link" in the mod you mentioned. If it is something that transmits BC energy, well the petrochemical generator is a valid destination for that, and it would, and should transmit power to the generator. If this is an issue in your current setup, the petrochemical generator does turn off when provided with a redstone signal.