1997 Chevy Blazer error code po440

1997 CHEVROLET BLAZER
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JAVONIE031
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Computer problem
1997 Chevy Blazer 6 cyl Two Wheel Drive Automatic

after i put on a new fuel pump about a week later my check engine soon light came on, one of the lines came off the fuel pump and i put it back on but the light is still on every thing is back the way i took it off and tighten, so what came it be?
Apr 12, 2010 at 4:58 PM
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BMRFIXIT
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Check hose on top front tank
If fuel pump gasket and all line on and correct
Next step should be a smoke test as that should show the leak
Good luck
Apr 12, 2010 at 5:07 PM