I doubt if the TCI unit is causing your problem with non-starting unless you have a problem with the 100 ohm resistor in the grey wire.
Is the petcock opening and flowing fuel? When my 250's bowls are empty I connect a spare hose to the vacuum port of the petcock and suck on it until the carbs are full, then put the vacuum line back on it. My inline paper filters have a clear plastic housing so I can see if fuel is flowing as the bows fill.
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