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The fuel pump control module is controlled by the ECM - engine control module , Possibility of DTC'S stored ! You need to take to Chevy Dealer !
The engine control module (ECM) supplies voltage to the fuel pump control module (FPCM) when the ECM detects that the ignition is ON. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in Crank or Run. While this voltage is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
Could be the pressure regulator on the fuel rail. Pull the vacuum line off the regulator and check it for fuel contamination. There should not be gas in the line. If there is fuel in that line the regulator is bad and needs replaced.
to change the pump , the fuel was drained out
so do you put it back and then prime the pump?
test for fuel pressure.
if non, then check for 12vdc at pump wires cranking
no 12v, you blew a fuse
if 12v good, the pump is bad or cant pump air, needs to be primed.
we check fuel pressure after every pump change;.
after all , that is and was the whole point of a new pump. right.
so check it.
over 30psi, (see FSM for full spec)
the labor time is 2.1 hours,but that does not include the drain and refill, hope this helps. information from ALLDATA 10.10. Please rate my fix as i strive to be the best, if you need more help get back to me
check for voltage at the pump. If it has 12v there, (and a good ground) then pump is bad. there may be a pump fuse on the fuse block (can't remember) but if you find it has blown, the pump may be getting ready to fail. If fuse fixes the problem, replace it and carry an extra with you, then change the pump.