You need the chase the fuel suction line back to the tank to see if there is damage(I had a critter bite mine) also the pickup foot screen in the tank may have junk plugging it. -- Fuel at the upper filter bowl should flow out clear and quick.
That low pressure is likely why you have replaced so many injectors -- really a fuel gauge would be one of my permanent additions, along with oil pressure and EGT
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Just watched the vid -- the fuel pump should run without cranking the engine -- do you get bubbles like that, or do you have to crank?
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Reason I asked about needing to crank -- compression can be introduced into the fuel rail by a leaking injector or copper washer. -- need to determine if this is a supply issue or a leaking injector seal.

 

Hey brother, thanks so much for the help/ response. Initially I thought this was a simple injector repair, but after the Injectors, more injectors continued to “drop out”. After weeks of working on it (only have time after work) I have discovered. The low fuel pressure is what has been killing the injectors all along. I ordered a fuel pressure gauge and will be installing one within the week, to keep an eye on it at all times.

In the video, the fuel bowl bubbles like that, with just the key on. The fuel pressure goes up to 45psi, then drops back down to 0, then fire it up and it idles at 65psi.

When I turn the key on, the fuel bowl begins to rapidly bubbly over like that, and has air purging out/gargling sound.

When I pulled the 304 FICM relay with fuel bowl off and turned the engine over, it produced the same results. As soon as your turn the key over it bubbles over like that. Then will continue to as your turn the motor over. All 4 injectors were replaced on the passengers side. How do I test the injectors to make sure they sealed correctly? And where do I begin chasing these issues? I’m new to the 6.0. I have drove the truck maybe 2,000 miles then out of no where problem after problem.

 

I just replaced the 4 injectors myself, so I guess it is very possible, they did not deal properly. I just don’t know how to go about checking that correctly. Also, how do you recommend I go about, reinstalling the injectors/re seating them/sealing. Thanks for any help man.

 

To test just the injectors you would fill the fuel bowl to the top -- then use the starter jumper wire on the passenger fender to crank the engine -- this takes the fuel pump out of the picture. No bubbles in the fuel bowl = good. -- crank about 15 seconds a couple of times.

Does the fuel drain back when the key is off? -- supposed to be a check valve in the fuel pump to keep the fuel from draining back. -- You can hook a length of clear hose onto the return fitting and run that into a container or back to the tank -- so there is less mess. The fuel pump should run for about 20 seconds at key on(could jump the relay to run it longer). That clear line should be bubble free.
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Had a similar issue on a customer's truck, it ended up being dried out orings on the cover that seals the water separator and the different chambers on the frame mounted lift pump i also changed the oring on the drain plug for the water seperator and this solved the issue with air getting into my upper fuel bowl and the gurgling sound. had low power and high boost aswell as weird shifting issues like the tranny wouldnt shift till you hit high rpm and let off the pedal.