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Just undo the return line where it goes from the flexible hose near the frame rail. Point the hose into a 5 gallon container, crank it up, and see how it runs. I did this to confirm that I didn't have a problem with my IP sucking air back thru the return line.

I had 3 air leaks on the supply line. THe 814 ran like crap, would not idle worth a **** when hot, and in a hard pull, the power would just go away. Finally replaced the flexible fuel line from the filter to the IP, and a brass fitting near the tank. Now the cummins runs so sweet, and idles...