2000 gmc jimmy wont start

Kelly, could be a few issues, security lock out, crank sensor, fuel pump fuse/relay, faulty new pump,faulty ignition switch, etc. Attached links may help you diagnose the crank no start issue you are having.
Check the attached links,video,instruction and guides, Good luck
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What is the fuel pressure? these trucks need a certain amount of pressure to start, if low just 3psi it will not start, if you are sure the pump is good then you may bad spider injector. check fuel pressure first and also try spraying starting fluid into throttle body and see if truck starts. the pump needs 60 -66 psi to start the truck.

Fuel pump issue.--

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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This will help.
Thanks.

anti theft engaged, or weak fuel pump. Check fuel pressure, Just becaus it runs, Doesnt mean its not bad, 45 psi minimum to run

if it is still cranking but not firing the first thing to check is fuel delivery. get a can of starting fluid from parts store and open the air cleaner box. spray fluid into half leading to the motor while someone tries to start the engine. if it fires you may have a bad fuel pump. good luck

check for a spark if no spark and no fuel to feed bar for injectors ,then try spare key if that doesnt work then its dealer only to look at immobilisor

check the crank sensor and the injectors also check all wiring especially that one for shorts or looseness

THOSE VEHICLES HAVE A HIGH PRESSURE FUEL PUMP THAT WILL ONLY START IF IT REACHES 60 PSI OR MORE.. BUT ONCE IT IS RUNNING REQUIRES LESS PRESSURE.... MAKE SURE THE FUEL PRESSURE WHEN STARTING EXCEEDS 60 PSI OR IT WILL NOT START...

the fuel pressure if leaking could cause this the regulator is located under the intake plenum but you should smell gas .if you dont then most likely the pump is bad ,the pump will come on for 2 seconds when the key is on then go off it will not stay on with just the key on only when you crank it will it .so have your fuel pressure checked with a gauge.

check your stater wires