Did you get a cheap fuel pump from Autozone? Airtex?

Those might last a week. There's a reason those are $150 and the name brand or factory ones are $400-$500.

Might be a good idea to take it to a proper mechanic for a real diagnostic.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!