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Sounds to me like it's your catalytic converter, do you smell any rotten egg smell or sulfur? There's ways of finding out by putting some sort of device on the end of your tailpipe but I have other ways of doing that that doesn't cost nothing. Lol but it definitely sounds like your catalytic converter does it lose power?
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.
It can take 70psi to start a vortec engine cold. It should start on starting fluid tho. You might want to look at a couple of spark plugs to see if they are in good enough condition to run. The spark could be weak under compression if the plugs are worn.
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
yea you have no fuel and sound like a bad harness and the gm's are know for there fuel pump harness's! did you change it when you changed the pump? there is a lose connection somewhere in the fuel delivery system and it's pretty simply! i would check the fuel pump relay on the left hand side of the engine compartment and maybe even put power to the pump at the relay position "b" on the fuel pump relay harness and there should be a one pin connector to put power to also connected to the same position on the relay "b" the wire should be tan and white! good luck
I also had this problem with mine. There's a main power cable that runs to the battery. The bolt was completely corroded, so there was no connection = no power to start the truck. Check that, it'll cost ya less than 5 bucks to fix.
If it starts with starting fluid, this means the firing and electrical is fine,however, its not getting fuel. I suggest trying the fuel filter first,but, its probably going to be the fuel pump.
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