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Q:

what should the fuel pump pressure should be? on 1997 Mercedes-Benz E320

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the car would just stop; and has no fault code. I changed out the crankshaft sensor, and the car did the same.
I changed the fuel filter because it was hard to blow through. I checked the fuel pump pressure; it was 70psi, but will change from 70 to 40psi. is this normal?
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