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I have an 2001 passat and it wouldn't start the other day. I got it started and took it to Advanced auto and they said it may be the alternator or O2 sensor. I drove a little further and it cut off completely. I left it over night and went back the next day and it started up fine. I took it to a shop and they checked battery and alternator and said both are good and fine.. what may be the problem??

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Did they do a fuel pressure pressure test to determine that its fuel pump? And if so what was the p.s.i.?It should be around 55 to 60 p.s.i. a few pounds under 55 p.s.i. Pump needs replaced, Your shop should have chk. this when it was there the first time. Did they by chance chg. the fuel filter, that can hinder it from starting too.

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