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Hello newbie here. I have a 2009 z71 crew cab I just dropped the tank to change fuel greasier sensor and reconnected everything correctly heard both wiring harness snap into place however after putting the tank back up the fuel pump isn’t heard when you cucle the key and it has no fuel pressure. I don’t feel relay clicking and the fuel pump fuse doesn’t light up with a test light however it’s not blown fuse I pulled it and checked. My question is do these have a fuel inertia switch? I disconnected both battery terminals and touched both cables together for 30 seconds to clear the codes not no fuel pump operation. Any one have tips or suggestions? 2009 Z71 Colorado Crew Cab
 

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There isn't a fuel inertia switch on these trucks. Not sure what a "fuel greasier sensor" is. Fuel pressure sensor or fuel level sensor? I'm pretty sure that there is no fuel pump relay on the 2009 model. The fuel pump operation is controlled by the Fuel Pump Control Module, located under the bed near the spare tire. Check fuses ERLS 15A and FSCM 20A.

Also check the ground next to the ABS module aft of the battery.
 
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