Fuel Filter Drain

[David Oxland]

I drained the fuel filter dry the other day, with the lever drain, in preparation for a filter change. The fuel all drained out readily in about 15 seconds. My puzzle is; How does air get in to replace the drained out fluid. In my mind if there wasn't replacement air the fuel wouldn't drain well at all?
Flooding the filter and relief valve went perfectly all right though. No stumbles on startup.

 

[Chad Sheets]

Not a physics man, but I would say gravity? Fill a bottle full of water and turn it upside down. The water flows out slowly, but it does flow out. Not sure if that applies here or not.

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[David Oxland]

Didn't notice any air running up the drain tube.