• The refinery was done. I turned off the power to the refinery and I turned on the pump.
• It pumped out successfully.
• I turned off the pump and turned the refinery back on.

The fuel didn't pool up in the refinery like it usually does, but it started dripping through the pipes to the tank, even though the pump was off.

It's like the pump was off but the pipe was still open so any fuel created just started leaking through the open pipe.

The wooden pipe has a small energy buffer. The item you call a pump is purely an energy producer and it's the wooden pipe that does the "pumping". The wooden pipe should stop extracting fuel when it runs out of power.

I personally don't really think this needs fixing.

This isn't a bug. Both the engine and the wooden pipe store some energy.

Oh ... interesting and pretty cool that it's coded that way!

Thanks!