[1QuickS]

Crud in the fuel filter means crud in the tank or deteriorating fuel lines. If car sat and crud passed thru filter then the first carb would get most of line crud ahead of second carb...maybe. Even with a t-fitting the carb with the straightest flow path will get the early shot of crud and the second carb would be a bit less likely to clog the fuel strainers in the banjo fittings. I'd pull the banjos fittings and check the fuel screens there for crud. You will want to pull the fuel screen in the fuel tank to check that it is clean as well.

Fuel delivery under light load shouldn't be an issue for any fuel delivery system offered through Pelican. If you have a big motor with big power potential then you may want to review your fuel delivery system for adequacy.