not getting fuel!?!? weber carb

i recently put a weber carb on my b2200, and it ran fine... for about 70 or 80 miles. i changed the in line fuel pump (i have a fuel cell) right before putting the weber on, and changed the fuel filter tonight. i have a fuel pressure regulator, and it's working. i am getting fuel all the way to the carb, but when i try to crank the truck, no fuel actually goes into the carb. i already took the small filter by the fuel inlet out and cleaned it (was a little dirty), and it still doesn't get fuel. if i spray carb cleaner or put a little gas in the carb, it will crank and run as long as the carb cleaner/gas i pour in there is there. anyone have any ideas what might be goin on here? thanks in advance.

you could have a stopped up jet in the carb it self with a little piece of debris when you were changing out the fuel pump / filter......

U said the fuel pressure reg is working? How well is it working? Is it adjustable and if so do u have it set to the right pressure? If u pour fuel into the throat of the carb u are bypassing the jets and float as Nitrd said. Check and see if jets are clean and if float is operating as it should. May have debris there as well. Bj

I had started my webber by pouring aprox 1 cup of fuel into the carb and it ran great after that I guess it primed it or soemthing