I can't seem to turn TCAS on help!And another problem is that the fuel system, I load 50% in the game but it shows thy I have 90% then 50% then 90 then so on.. Back and forth and weight keep changing also it happens on my PMDG B747/8i

To turn the TCAS on, turn the TCAS switch to TA/RA, and press the TFC button on the EFIS panelAnd the fuel problem, I don't really know what to say, but runing the game as Administrator might help (if you haven't allready done so)Try searching the Forum and the FCOMs

Well I always run in admin

You are loading fuel via the FMC right?? ....you DO NOT load fuel via the FSX fule/payload menu.