On Sep 19, 3:47*pm, Bertie the Bunyip wrote:

No, nothing to do with the sump drains themselves. The sump area is a
small depession at the bottom of the tank. All water in the tank should
go there by design. However most tanks have small imperfections in them
where water can get into and stick there. You do a nice calm walkaround
and drain your fuel and then when you start taxying, the water becomes
dislodged and gets into a feed port. With some designs, this can add up
to a lot of water...

Gotchya, gotchya and gotchya, never thought of what you say, and makes
perfect sense.

Tanks I have are "stainless steel" and not bladders, so I **think**I
have a lesser risk of water settling where it shouldn't be but like
you say, a good shake would be prudent to better assure the water
indeed does settle down to the sumps so it gets sumped out.