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Thanks for the feedback guys!
It turned out that the problem was the filter screen on top of the sediment bowl. It must've slipped sideways the last time I removed/replaced the sediment bowl, and overlapped part or all of the width of the rubber gasket on top of the sediment bowl.
When I ran the engine last week, after shutdown I pushed lightly on the side of the sediment bowl and gas spurted out. I removed the bowl and noticed the misalignment, and was careful to get it aligned before reassembly. I pushed it upward so it centered and stuck in the cap, then raised and secured the sediment bowl.
I've tested it three times since then, and have no more leaks.
The strange thing was that before the fix, fuel got over on top of the fuel pump and even on top of the sediment bowl cap. It must have been spraying pretty forcefully, but briefly.
After the fix, I realized that the first time I noticed the leak was on an outing soon after I had removed and cleaned out the sediment bowl.
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