Fuel pump relay cuts off fuel supply when the engine is not running.
Not sure however if your 104(?) combined the FPR with another module in the later years.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k