Did you loosen an injector line to see if you are getting fuel to the cylinder? Did you bleed the filter when you changed it? Was the rebuilt pump properly timed when it was installed? Are you sure all the air was bled out of the system after the pump and filter were changed? Do you have air bubbles in the fuel return line?
A copy of Haynes Diesel Engine Repair Manual, part #10330 ($20) could prove to be invaluable to help you track this down. It has excellent coverage of GM 6.2 and 6.5 engines. Hope this helps.
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