http://prntscr.com/amlo6p
my gas output is reading 8.2 my light oil is at 6.3 but my heavy oil is coming out the refinery at 0.0
I lost all pressure when my refineries stopped working cos my peterol storage got full , i fixed that and refineries started working again but I can not get my heavy oil pressure back up, I stopped all production that uses lubricant , and all heavy oil cracking but the pressure still wont return, Im at a complete loss I really dont understand these random pressure drops, I have tried googling but I just get answers related to long distance pumping and pressure, wich is not the problem here.
I had been keeping my storage in check b4, but I was replacing a lot of furnaces with electic furnaces and upgrading my belts so hadnt been back to check on my oil system for some time

If anyone could please take a look at my screenie and offer some ideas i would be eternally grateful.. thx a lot in advance Dougal.