From the moment car starts to the moment engine stalls, which is about 40 - 60 seconds, fuel pressure is always above 50 psi.

Can I safely conclude stalling is not caused by fuel system problems?

I have also changed battery and alternator and the replacements did not solve the problem.

What else should I check for? Thanks.

  • Which car is this? Is this the Merc? – Zaid Oct 1 '15 at 5:35
  • Yes Mercedes 1993 300SE – David Xu Oct 1 '15 at 5:48
  • 1
    Do you know what fuel management system your Merc has? My book says that the Merc 300E of this era should have a KE5-Jetronic setup (electronic continuous injection). I don't have an entry dedicated for the Merc 300SE but I guess the difference is just in chassis, not engine. Also, 50 psi is low for a KE system. The system pressure is designed at 5.0 bar, which is 73 psi. I'm not saying that this is an answer, but if you can confirm what system you have we can hopefully infer something about your Merc's condition – Zaid Oct 1 '15 at 7:02
  • Also, David, this is essentially the same as your last question. Since that one has no answers on it, I'm going to vote to put that question on hold. – Zaid Oct 1 '15 at 7:07
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    Why do you say that fuel pressure is not an issue? Could you mention your references? My source is a book that is officially sanctioned by Bosch, which says that KE systems are designed to have fuel pressure at 73 psi. If your fuel pressure is indeed lower than expected it would go a long way in explaining why your Merc is stalling once the cold-start injector has done its job. – Zaid Oct 1 '15 at 7:18

Look at fuel filter at the first place, your car's old and i have an experience that fuel filter change in 95 perc. of cases solved all issues

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