shaking,losing accelarATION on 1998 BMW 740i

HOW U KNOW WHEN FUEL PUMP IS GOING BAD?

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2 answers
you prove it by performing a fuel pressure test
You can confirm a fuel pump is good or bad by checking fuel pump pressure, fuel pump delivery volume and looking at its scope pattern on an oscilloscope. Also verify correct voltage is present at the pump with no voltage drop.