Vacuum Pump to Remove oil from HPOP
 

Here is a link to a thread I posted in the 94.5-97 forum has pics and application for a pump to remove oil without out a gravity drain option, hope it helps out

https://www.ford-trucks.com/forums/6...from-hpop.html

everytime i change oil on a 7.3 powerstroke i suck the oil out of the HPO reservoir, because of the fact it gets alot more dirty oil out and clean oil in.

Here's what I have. 07300 PneumatiVac Second one down on this page.
http://www.mityvac.com/pages/products_fee.asp