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When you say spews gas, are you referring to when fueling? if so then the tank vent is likely clogged or the anti slosh valve in the filler neck base is likely stuck closed.
Lean codes are normally caused by vacuum leaks, low fuel pressure, or a misfire. Since you also have a miss on cylinder 8. Lets verify the compression, spark, and injector pulse to it are good.
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We have 7 days to get this addressed and rated. if there is no rating before 7 days, then i no longer see your replies. Rated prior to 7 days and still working with me is not a problem. Are you able to run the truck only using the front tank?
Can you check these things then we can address the front tank issues?
Thanks for all the info you have gotten from blogs. Repaot back when you can on the tests I mentioned.
You can disconnect the negative battery cable for 5 minutes to erase the code to see if it returns after 4 starts and drives. 120 psi is low, can you check a couple other cylinders?
That is good compression.
Below is the wire diagram so you can test the selector and wiring to the pump and pump to see if the front pump is or is not getting power. The front tank will refill from using the rear tank through unused fuel returned by the pressure regulator. Its however overfilling because the front tank should be emptied first before switch over to the rear tank, and your not able to do that because the front tank has no fuel pressure.
You could I guess route the return hose to the rear tank and bypass the front tank. I have never tried or done that though.
Unfortunately the age of the vehicle prevents that. Ford purges the non common repair guide pictures after 10 years to free up disc space leaving on the text in the repair guide which is virtually useless without the pictures.
I would need to know the wire colors and where the wires end, meaning what they connect to. All connector views under 5 wires are also deleted from the diagrams.
On the injector rail is a fuel pressure regulator. The fuel line connected to it, is the return to the fuel tank. Follow that line to the fuel tank.