2000 Mercedes-Benz S500 Q&A

2000 Mercedes-Benz S500 Question: what is my next step to troubleshoot getting fuel to fuel pump?

after replacing the relays under backseat again bc there was water in the relay boxes again, (don't know why), now the fuel is not getting to the engine. The fuel pump relay does work and so does the fuel pump. What would I troubleshoot next. -
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I replaced the fuel system relay and there's still no fuel getting to the engine. What is my next step to troubleshoot this problem?