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Yes, there is a drain from the intake valley into the bell housing, and out the weep hole at the bottom of the bell housing. The valley may appear dry, but there is still a leak. Perhaps when the vehicle is moving, the air flow, etc, allows the leaked fuel to reach the drain before it...

Yes. The throttle shaft seals are a common leak point, along with old fuel lines. Try placing a rag under the IP and take it out for a drive, then check the rag for fuel.