Tried the underhood tank and the car ran wonderfully. So the issue was at the rear of the car. Going off of the assumption that the issue was with a collapsed/leaking fuel line, I threw a new 3/8" hard fuel line for the supply. The car ran the same. Drained the tank through the tank screen and discovered that the screen was clogged again. Likely from sediment that the PO had built up with veggie oil. Cleaned the screen really well and threw it back in with a few gallons of fresh dino and it ran the same. Drained tank again and found that the reservoir that the TD has in the tank had collapsed whilst the tank screen was clogged due to vacuum build up when the screen was clogged.

My thought on this is to install a standard 300D tank screen however, I'm not sure if the threads are the same. Can anyone verify that?

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82 300TD
75 300D
99 F350 Crew Cab 7.3 Powerstroke