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Old 08-29-2015, 10:24 AM   #1
hairtrigger
 
Drives: 69 Chevelle SS396 2013 ZL1
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Bad fuel pump

My car started to fall off at 3500 wot and backfire but no cel light came on. The scan said P2635 Fuel Pump A Low Flow Performance.
Why was there no light?
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Old 08-29-2015, 11:39 AM   #2
nighttowl
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The error would have to occur a couple times before the ECM will show a light.
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Old 08-29-2015, 11:39 AM   #3
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Found out mine was "weak" while trying to tune after cam swap....replaced under warranty and OK now....although maxed out.
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