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Got Error code P0171 & P0174 after fuel pump replacement
1999 Chevrolet Silverado 1500

Got Error code P0171 & P0174 after fuel pump replacement

(1999 Chevrolet Silverado 1500)
I just replaced a fuel pump in my truck, and within a week got a check engine light. Scan says error code P0171 & P0174, which shows bank 1 & 2 fuel system too lean. Could this error be related to my recent fuel pump replacement?
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1 answer & 2 comments
Popular Answer
on December 20, 2016
Yes - Insufficient fuel pressure .. Did you replace the fuel 'filter' as well? .. Suggest fuel pressure test.
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on December 20, 2016
No, I did not replace the fuel filter when I replaced the fuel pump, as I had put in a new fuel filter about a month prior to having issues with the fuel pump. So I didn't think it would be necessary. Should I replace this month old fuel filter because I did replace the fuel pump?
on December 20, 2016
I always replace the filter when I replace the pump.. However I usually don't know how old the filter is .. Fuel pressure test would be a good idea.
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on December 20, 2016
Yes - Insufficient fuel pressure .. Did you replace the fuel 'filter' as well? .. Suggest fuel pressure test.
Sign in to reply
on December 20, 2016
No, I did not replace the fuel filter when I replaced the fuel pump, as I had put in a new fuel filter about a month prior to having issues with the fuel pump. So I didn't think it would be necessary. Should I replace this month old fuel filter because I did replace the fuel pump?
on December 20, 2016
I always replace the filter when I replace the pump.. However I usually don't know how old the filter is .. Fuel pressure test would be a good idea.

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