I find it difficult to believe that the pressure in the wing tank(s)
was significant,

Ok, "overpressure" is the wrong word, but it pumped gas into an overfull
tank causing the fuel to go overboard and read "more than full".

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.