[Farmall] filter or carb?

[CGS]

I have a 1958 Worthington tractor (unfortunately I sold my '48 H several 
years ago) which, after a few months of sitting, now acts like the fuel 
filter is clogged. It runs for half a minute, then starves. I think it 
acts like a clogged filter; my brother-in-law says it is interaction 
between unleaded fuel and the carb's valves. Filters are easier to 
replace than carbs.
Help appreciated.

-- 

Charlie