Why isn’t fuel going to the carb?

RedFish said

The OEM return was only fuel vapors from the bowl vent on the OEM carb. There was a charcoal canister with flow check valve.
Maybe some do use this metal pipe for a liquid fuel return. My questions , Can all the fuel go that route? Will fuel pressure delivered from the pump push any fuel through the tiny orifice into the bowl? How long might it take to fill the bowl if there is no restriction in that return path?
You might answer some of these questions with a clamp on that return hose.

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I agree. I removed the purge canister system from my Dakota when switching between carbs and EFI sytems (multiple times) and have used the canister hard line for either a return or vent depending on my requirements. I believe with that T hooked up you have NO vacuum being pulled by the mechanical pump and even if you can get it to prime you cannot maintain 5# - 7# fuel pressure at the carb. Block the T, prime the fuel bowl, ensure enough gas in tank for new pickup and you should be good to go.