So if there is an MG in house + MG outside should I just forget about that fuel/VP until T2?
If there are 2 MGs so early, I belive they stand alone without support of Grens. If so, smoke them, nade the one on building once or twice (I assume you use 2-3 rifles agasint 2 MGs covering each other) and try to get behind outside MG with smoke. Once you smoke, enemy has 2 options. Keep them and expose to nades - move them back which means you can try to get behind.
It's helpful to attach single hotkey to each Rifle squad in such moment so you have easy access to each squad which means easier flanking.