Ok so i went and tested the fuel pressure on the return side. At idle the feed is 42-44 psi and return side is 6 psi. This tells me the pump is weak like u guys said. Im gonna replace it and hope it helps.

 

Dirty 30: Did you R&R the fuel pump? If so, did that fix the problem? I have the exact same problem I've been chasing for a couple of weeks now, and don't want to just throw parts at it.

Thanks.

 

ive got this problem now too, would like to know if its the fuel pump also before i spend the $500.

 

Hey wasup im just got the same codes on my 2004 ss did changing the fuel pump fix the problem thanks

 

why would low fuel pressure be cuasing knock sensor codes to show up? j/w i also have been battling knock sensor codes, but i have yet to ohm out the sensors or check/add a block ground... guess i need to also check fuel pressure while im at it...