[Tf175]

No electric fuel pump unless something has been added . The fuel pump is basically a transfer pump , the real pressure is developed by the injectors . Timing adjustments on fuel racks critical. 
As has been mentioned,  try feeding fuel from a 5 gallon bucket or similar . 
There is a feed tube in the top of main fuel tank .
Could be something wrong with that . Mine is just forward of the entry door , under a bottle rack .
Definitely sounds like a fuel issue. 
There are 8v92 TA manuals online in pdf form , I find very informative. 
 
You Tube videos by Bus Grease Monkey are also a great source of information.  He has many videos addressing power loss . 

For what it's worth , when we bought our coach in 2017 I was going to fix everything in a couple of weeks ...