Weak idle to nothin

Hey y'all
Just got the slant running great yesterday, go to start it today and it can barley idle (have to keep pumping the gas to keep it alive) so i guess it doesn't idle at all. new fuel pump rebuilt carb new filter was running like a sewing machine yesterday. the gas looks ok smells a little funny, don't want to go rippin into this carb. any thoughts would be greatly appreciated