i am sure you checked for leaks correct? a small leak will cause a pressure drop.
if no leaks then proceed......
pull fuel rail off leaving it still attached to fuel lines. will looking @ the injectors spray nozzles, have someone cyle the key on....... wait for dripping injector..
also.... this was a complete gm pump module correct?(housing,wiring,pump, lines) if not and just changed the pump it self you could have a ruptured feed line from module housing to pump
let me know what happens from there.
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