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post #1 of 3 (permalink) Old 05-25-2011, 10:15 PM Thread Starter
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Date registered: May 2011
Vehicle: 1980 450SL
Location: Georgia
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I've been reading items on this forum over the years to help an older friend with his '80 450SL. He had this problem with the car when he bought it in approx. 2000. He developed cancer, and I tried to get this car running so he could at least drive it some before he left us, to no avail. Being the character he was, he left me the car/project. After years of replacing fuel pump, filter, cleaning system, ECU, etc, I actually replaced a relay and the car ran fine for awhile. The relay I changed, I thought until tonite, was the fuel pump relay. Now I'm not sure. The car runs fine but as its driving down the road, it dies. Just before it dies, the relay I changed clicks and it dies. Sometimes it will click again and its running as if it is the fuel pump relay cycling on and off.

I pulled the relay and it does have scorching. It clicks as if it's the fuel pump relay. I've nothing that says what this relay is except a general purpose silver, 5 pin relay. Nascar posted a picture a while back of this relay area on passenger kick panel, but doesn't id this relay. It should be some innocuous relay but seems to be playing a major role in this car not cooperating. It is the left silver 20a/30a relay below and behind what should be the overvoltage potection unit and fuel pump relay.

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post #2 of 3 (permalink) Old 05-26-2011, 04:19 PM
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Welcome to benzworld.

Have you done a forum search to hopefully find the answer to your question? Search in the "R107" chassis part of the forum and if you can't find an answer you ought to post this same thing in that section to hopefully get better responses there. Good luck my friend.
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post #3 of 3 (permalink) Old 05-26-2011, 11:35 PM
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