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Old 11-01-2015, 02:38 PM
mbzman's Avatar
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Join Date: Nov 2008
Location: Canada
Posts: 604
300CE M103 no start

Went to move my 1989 300CE out of the garage this morning and it would not start. It turns over strong but will not fire. If I depressed the throttle I could get it to catch and run for about one second before it would die. After a few tries I noticed I could not hear the fuel pump as it normally primes before starting. I quickly swapped over my fuel pressure regulator and OVP relay to no avail. Still can't hear the fuel pump when I turn the key.

In the past few weeks it has been hard to start and would often die after a minute but would restart and stay running eventually. Is there another fuse in the engine compartment panel that controls the fuel pump? I checked but could not see anything. My OVP and FPR have both been replaced in the last 5 years.

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1989 300CE
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Old 11-04-2015, 11:12 AM
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Join Date: Mar 2003
Location: Southern California
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...had a similar problem last year on my 190E 2.6. It turned out to be the fuel accumulator. Search for a couple of posts by me on the subject to learn about the simple tests I ran to isolate the problem.

I have yet to saw it apart to do the failure analysis I mentioned, but maybe next week.

Duke

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