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Hello Billyjobs,
Your fuel tank will have one outbound fuel house and one inbound. Your carburetor has an inbound that fills the carburetors and then excess fuel is returned to the tank. If fuel is not getting to the fuel pump it could be a few things.
Fuel pump has no sucking power. You can get a 3psi electric fuel pump from local auto parts store as a temporary solution. If you want to keep the original mechanical type it can be rebuilt or replaced.
Fuel tank empty. If you put more than five gallons of fresh fuel then move to next possible cause.
Fuel tank clogged. Three bolts hold the tank in. There is also a plug connected to your fuel level sender accessible from the trunk under mat and plastic cap to disconnect. There will also be two small hoses connected to he neck of the tank that ventilate to be disconnected. It is best to use a transfer pump to siphon out as much fuel as possible before disconnecting fuel lines and have a deep drain pan under the hoses when you removed hose clamps. As mentioned already be careful and make sure your workspace is well ventilated and there are no ignite sources nearby. Fire extinguisher close by is a great idea any time you are working on combustion engines or using solvents or playing with matches.
Cleaning the tank on a forty year old car is a common task that you can do yourself. POR15 tank renewal kit is less than $100.00. Look it up on YouTube for more information. You may prefer to have to have a professional shop clean your tank but ask if they coat it so you don't have rust issuse in the future.
Keep us informed. Your before and after pictures are inspiring!
Jeffrey
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