That seems low to me. In my experience a fuel pump should measure between 45 to 65. I'd say either there is a restriction or the pump is junk. Never did have any luck personally with junk from autozone. When it comes to fuel pumps the best and only way to go is factory parts. I only use Delphi or Ac/Delco parts for fuel on any GM. Aftermarket parts just don't cut it with them
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