Check the current draw by setting up an inline fuse. Upon turning the ignition to "on" position without starting the engine, the current immediately killed My 10A inline fuse.

Changed the fuse to 15A one, the pump kicked on without problem. Turned the engine, the engine started without problem either with 15A fuse. the inline fuse wire is hot. Very hot.

I think it's the fuel pump. Apparently the pump is drawing current that killed my relays.

What do you guys think?

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11 S550
09 C300
91 560SEL
90 300CE
84 380SE
83 240D