https:youtu.b/nGiGYQ0zw6s1983 300SD, 206,000 mi.

I have changed all fuel lines including tank. fuel strainer clean, new injector nozzles and balanced (Greezer), rebuilt lift pump (Greezer), with new primer. I am running engine in video from a gallon jug to eliminate everything back of primary. I need to stop this air from getting in. I have installed a FAII to see bubbles in return. Funola Air Ingress Indicator. Please Advise.https://youtu.be/nGiGYQ0zw6s