Why is my just-serviced 2004 Honda Shadow Aero leaking gas from under the air filter cover when running?

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A cover crop seed I just wanted to grow to plant as an intentional weed in the garden here and in NJ. I plan to fight weeds through intentional companion cropping. This is a legume.

Question by Ben: Why is my just-serviced 2004 Honda Shadow Aero leaking gas from under the air filter cover when running?
I had my ’04 Aero serviced on Wednesday, July 25 (routine 12,000 maintenance; it’s never had any problems). I rode the bike to work & back on Thursday. This morning (Mon July 30) it started spitting gas whenever it’s turned on, apparently from under the air filter cover; hasn’t been touched since Thu. There’s a little spinning knob under the cover (not inside; just beneath it) that I think is the idle adjustment (based on a friend’s thought after explaining the problem), & the gas appears to be coming from here.

I admit to not knowing much about bike maintenance. Same friend suggested the problem was probably a hose the shop put on too loosely, or wrong size, etc, which would make sense since the problem cropped up after the maintenance, & suggested I open the filter cover & poke around for some loose / missing tubes. I couldn’t find anything; it was a bit dark outside, but I found no tubes at all.

In the morning I hope to find my manual & see what it has to say. Can anyone help me?

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