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Discussion Starter · #1 ·
Back at it again... recently notice that I got the following code pop up. P2636, I believe this code has to do with the rear fuel pump, so I went ahead and replace it with a AC Delco unit and the code is still coming up. Not sure where to go from here... would appreciate some help here.

Thank you in advance for your help

2004.5 LLY, EFI live. Everything else is stock.
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