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working on friends car,2002 grand am found gas in the oil, why? on 2002 Pontiac Grand Am

3.4l changed oil , next day found gas in oil again,i am baffeled, can you help

Asked by for the 2002 Pontiac Grand Am
Check for defective fuel pressure regulator. Remove vacuum hose to the reg., eng.off, and see if gas is in hose.
if so reg. is shot.