Date registered: Jun 2005
Vehicle: 86 190E 2.3L 16V, 93 400E, 95 320TE, 98 S500
Location: Seminole, FL
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The fuel pumps should run while the car is running. When first energized, the pumps will "prime" the system then shut down. When the engine starts, they will then run constantly. Your car has a fuel pump relay that I believe is located behind the plastic shield, behind your battery. If not, others on the forum will correct me and provide the correct location.
There is a two prong connection for the pumps located under the passenger rear seat bottom. You might use that for your connection point until funds are available for the relay. Relay's are a tic over $100 or you could possibly find one in working order at a pull-it yard. The relay looks like this....