I have an aluminum moroso 20485 oil pan. It has spots about 1/2 way front to back for drain backs but seems like the g-force would stop the oil from draining forward to the ports. I installed drain backs to this spot and didn't help. There is another port about 3" up from the bottom of the pan that is clear at the back. It is in the oil when not running. I pulled the plug and 1.5 qt came out. My question is will the vac pump want to pull the oil up the drain back hose if it has oil covering the lower end of the hose? It pulls around 15" of vacuum. It looses all oil pressure on decel so I just shut it off but would like to be able to fix it if possible.