You see, the problem here is...

[IMaKIDfromPH]

Well, as you can see (if you can see) my problem here is that in the image below... kinda weird actually that it's a COMPLETELY different part and that it may be an old part and when KSP updated most of the parts didn't as documented before...

See images here: https://www.facebook.com/unlimitedplaneworks/?ref=hl

Edited October 30, 2015 by IMaKIDfromPH

[xendelaar]

I don't see any picture in your post

[Harry Rhodan]

http://wiki.kerbalspaceprogram.com/wiki/Mk1_Liquid_Fuel_Fuselage

1.0.3

• Dry mass increased from 0.15 to 0.25, capacity increased from 150 to 400.
  

Old craft files still have the old value.

[Red Iron Crown]

Detach the tank and reattach it and the new values will be used (you'll have to resave it, too).