Hi
@SL1D3X !
I am testing this already in-game around the map, to see if this happens only at certain gas-stations.
So far I wasn't able to refuel the DFT-30 Truck at Angelpine gas-station.
I will keep you updated.
Edit:
So far I haven't been able to refuel the truck myself, in different gas-stations.
The refuel animation barely starts, and it only shows up for a second, as you stated.
I wasn't able to refuel myself not a single time.
I will log this bug.