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Hello, I've modified the car-server.toml and managed to get the fuels into the gas_station (ImmersiveEngineering Gasoline), but whenever I try to refuel the car it just doesn't work, it does detect the car nearby.
What I did is adding the other mod fluids into the #car:gas_station tag.

As for the car, I managed to empty the fuel by driving around (Is there other way to empty fuel by clicking?) But I just can't get to use the other mod's fluid to fuel the car, any idea what goes wrong?

You need to add the fluid to the fuel config. Adding it to the gas station only allows the fluid to go into the gas station.