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All Echo gas caps are SEALED. No vent in them.

The vent is a seperate hose coming out of the fuel tank, and it has a small plastic vent at the end of it.

I would guess plug first, then carbon buildup. Though, carbon buildup on blowers is RARE, as we always operate them WOT, and this keeps them clean.

But that screen could have clogged, and in any event it shouldn't go back in.

If the 603 has mixture screws, they can become loose and move a bit causing this. Now all new 2 cycles have SEALED carbs with idle speed being the ONLY adjustment.

Good Luck!
 
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