The information you are missing is the hardware design of Carloop version 2.3, which can be found on GitHub:
The connector has the following:
Pin 1: GND
Pin 2: 3.3V
Pin 3: GPS Tx
Pin 4: GPS Rx
Pin 5: 3.3V
Pin 6: GPS Enable
I am guessing the SparkFun GPS uses:
Check the power requirement to see that it will work with 3.3V. If it needs 5V, then you might be able to pick that up somewhere else from the Carloop circuit board.
If the GPS has no enable connection, then it will be always on and always using power.