2000 Ford excursion 7.3. . Seems like its taking longer to prime. Sometimes will turn key to start and nothing will happen. Will wait and try second time and will start right up. Idles fine. Press the gas and very slowly gains speed even though RPMs high. Take foot off of gas pedal and press again, it will shift and again will slowly pick up speed. Doesnt seem like turbo is kicking on. Loses power at 70 and occasionally stumbles. No check engine light. No codes. Had pump replaced a yr and a half ago. Fuel gauge in line after pump reads 50+ at idle drop to 28 at full speed. Shut truck off and pressure drop to 0 within 5 seconds.
Any ideas?

 

You shouldn't be losing that much fuel pressure from idle to highway speeds... How does your filter look?

 

Changed filters about 2 weeks ago but double checked them anyway. They were clean. No signs of water or clogging. Started checking turbo lines. All look ok and not clogged. Waste gaste was stuck. Got it moving. Am going to run truck today and report back.