ok that explains why you dont have many problems then.
im think for the fuselage tanks as a single tank .
you can use only use about 70% of the fuel before foamy fuel starts filling the uat.
but can be solved.
since you empty the wing tank first , then the main tank fuselage you would have no problems.
good solved.

so gary at jet-tech has a job to do then.
he makes nice tanks.. the only bit i ever used you can see on the last picture i posted where the refurbisched flash tank
has a part of a eurosport jet-tech tank