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Originally Posted by blazee
The fuel presssure is low. All the 96 + came with CSFI. The CSFI engines look like they are TBI. They have a throttle body on top of the engine, but they are not injected through the throttle body. They have six injectors centrally located inside the plenum (out of sight). You can't see the injectors from the outside and it has been mistaken by many to be TBI.
The fuel pressure spec for CSFI is:
Key On Engine OFF (during the intial 2 seconds when the fuel pump is running - 61 - 66 psi
Key On Engine OFF (After the fuel pump shuts off) - 56 - 60 psi
Key On Engine running it should drop 3 - 10 psi
Just to verify that you do indeed have a CSFI, check the eighth digit on your VIN # and make sure that it is a "W".
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Thanks for clarifying that mine is a CSFI. The eighth digit in my VIN is a "W" so I am assuming that is what you mean....I have the CSFI on my Blazer. So with that cleared up, I guess I should replace the fuel filter and recheck the pressure?, then if its still low, drop the tank and replace the fuel pump assembly? Is this the right course of action? And the last spec you gave me "key on engine running" the pressure should drop 3-10 psi from 56-60 psi, correct? Thanks for your help.