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What are some of the signs and symptoms that my fuel pump is bad or going out in my 99' Saab 9-5 3.0L V6? And if it is going out or bad could it cause my car to read P0172(system running rich)??
 

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Is it audibly loud? Does it have long cranking before starting?

If anything it would be lean, not rich, I would think.
 

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I'd take a look at the H02 sensors first.

And as stated already, fuel pump going out would cause a lean condition, not rich.
 
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