Just measure your fuel pump output pressure. If you don't have a gauge, you can just use a length of hose. There is also an output volume spec in the service manual.
They probably need an ultrasonic bath or fine wires and compressed air to get all the idle passages clear again. It's not really an ethanol problem, more a lack of use problem. Now the rubber parts going mushy and decomposing, that's an ethanol problem.
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