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Pump have a different specification. There is a list posted that shows model number / specification number of pump to the year engine and use. List is posted on this site try;
http://www.steelsoldiers.com/showthread.php?110581-List-of-Stanadyne-DB2-pumps
Ttchutch, attached are three pages from the GM Factory Manual for the 6.2
Covers Diagnosis Procedure for fuel pumps
Attached is a PDF copy of the GM 6.2 Factory Service Manual
Regards
Joseph