Fueling problem in 1974 Toyota Landcruiser

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Klooge in an diode electrical fuel pump $10 - see if it draws fuel.
Maybe the float/needle valve is stuck - wack the carb with mallet and see if flows.
Could be crap in tank(s) is blocking pick up - use like 5 psi air into the line to blow the crap free - listen for air bubbles at the gas caps. Add some yellow bottle gas dryer to the tanks - paper elements in fuel filter will not pass fuel if wet from water - warm days cool nights will condense water right out of the air into you gas tank as well as the station selling fuel. Set used filter in the sun for a few days it will dry out and be good as new. I cycle threw like 3 of them.
Does your carb have a electric cut off? - yes check the connection.

This my fuel transfer pump - switched fused filtered 5' draft 20' delivery with like 12' of power cord that will fit the battery or cig lighter was like $50 of parts from Amoron and ebuy. I use it to move fuel from 5 gal cans to rigs. If you switch hoses you can drain fuel tanks making them easier to drop for cleaning out crud.

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That taped up connection on your tank selector valve could be a source of a vacuum leak - fuel pump will selectively suck air and not pump fuel. Cut off an inch of hose and re-attach.
 
Appreciate any help
Lot of things here.
Rebuild your old carb, a '74 carb is better than what you have on it now. I don't see a fuel return line and can't figure out how you are getting pressure inside your tank, are you very sure it's an outward rush of air when you open the gas tank? an inward rush would be more helpful...
I have a '74 and still run the fuel return line, I like it. I get an outward rush of air oftentimes and think it's normal. My gascap has a relief valve and sometimes makes a humming sound as it vents.
Fuelpumps can go bad but they're easy to check and easy to rebuild. If my fuelbowl ran dry while driving I would suspicion a stuck needle valve or clogged filter or venting issue before the fuelpump.

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That looks like a stock fuel pump. (Looks like Kyosan on the top)
However they can fail.
I would unhook fuel line from the carb, then crank it a few times to see fuel flow from that line. Should be a good flow into a container. I like a glass jar so I can also see what the fuel looks like.
I would also isolate the after market tank and run it off the new tank until you can figure it out.
 
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