Hi faxcap & rick.
What C130 where you flying,i only had problems once i loaded the extra pack,but it was not fuel related.
I never had this fuel problem,but one thing that would cause this,is if you have accidently operated fuel dump,when flying,on the external view,are you getting a fuel vapor trail,this would be the givaway,that the fuel dump was active,also look on your fuel panel,upper left/right,for the dump switches,and make sure they are off.
Also use the ace for the fuel level selecting,before you fly in the sim.
regards alan. 8-)