Well let me just post how my EFI was setup then I will go on to describe how my Carb setup is now arranged.
When I was running fuel Injection last year, I had an IN-Tank 190 Pump with the Stock Pickup. From there it ran to the stock Fuel Filter. From the Stock Fuel Filter it ran to the front of the car where in then snapped into the Stock Fuel Rails. I had a Kirban Adj. Reg.
A Fuel Gauge was plugged into the Test Port on the Fuel Rail.
So that was my stock setup. Also I ran 30# injectors. If fuel is not getting to the rails then something is clogged or not setup right.
Now let me move onto my Carb setup, a bit different.
I have a Stock tank that has been modified with a Sump on the back. From there a 10-AN Line comes from the tank to a Aeromotive Fuel Fitler. From the Fuel Filter it goes to a Holley Blue Pump. The line runs from the Pump to the front of the car where it attaches to my Holley Fuel Regulator which is currently set to 7.5 PSI (Carbs take allot less pressure). From the Regulator it splits off into a Holley 750HP Carburetor.
At this point I get to watch my Gas Gauge drop really fast
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Ok, hope that helps.
Please post more details and maybe we can get this sorted out.