HOW U KNOW WHEN FUEL PUMP IS GOING BAD?
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1998 BMW 740i Question: shaking,losing accelarATION
Answer #1overbys from Overbys Inc, June 17, 2011, 09:08Master
you prove it by performing a fuel pressure test
Answer #2patrick mannion from Greg Solow's Engine Room, June 17, 2011, 10:31Master
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.