300E fuel pump relay question - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 05-14-2019, 11:13 AM Thread Starter
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300E fuel pump relay question

Hey guys, I pulled the fuel pump relay off my 300E, I have attached a picture.

Can someone pls tell me if it looks like it's been repaired?
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post #2 of 15 (permalink) Old 05-14-2019, 06:26 PM
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I would say yes it has been repaired. When products are manufactured the QC process sometimes kicks a piece back because it fails final test and then it is repaired and presented to QC again. But this does not look like the kind of repair done at the factory. It appears the trace on the board was either damaged due to a failure or when someone tried to do some soldering they damaged the trace. The wire running from pad to pad in the horseshoe pattern looks like a repair by a previous owner or maybe some repair shop. MB would not allow a supplier to pass a piece with trace damage off as "new".

edit: (at least they wouldn't have passed this off as new back when the W124 was being produced; who knows what they do today)

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post #3 of 15 (permalink) Old 05-14-2019, 11:38 PM Thread Starter
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Thank a lot for your help. It's time for a new relay.
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post #4 of 15 (permalink) Old 05-15-2019, 02:00 AM
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Are you sure its faulty ? What problems do you have .

This is a retro ride .
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post #5 of 15 (permalink) Old 05-15-2019, 02:05 AM Thread Starter
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Car randomly stalls. OVP is replaced with new unit. Mechanic says its the relay.
Plugs, wires, distributor and rotor were recently done.
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post #6 of 15 (permalink) Old 05-15-2019, 11:03 AM
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If the engine suddenly shuts off but easily restarts I would strongly suspect the relay. But you can verify this by listening for the fuel pumps to be running once the car stalls. Leave the key in the same position its in when it stalls and listen for the pumps. If the relay is the problem, the pump(s) will not run. Is there a date code on the suspect relay?

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post #7 of 15 (permalink) Old 05-16-2019, 01:38 AM
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Might be the CPS . You can have the same symptoms with CPS It will start after its cooled down. But you can bridge the Fuel pump relay to rule it out . Once bridged it will run forever till the bridge is removed than it will proove if it is the FPR at fault or not. Just wrap a wire around no 7 and 8 on the base of the relay unit and pop it back in to its holder at the rear of battery.,dont leave this wire in there do remove it after you prove that the FPR is faulty or not.

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post #8 of 15 (permalink) Old 05-16-2019, 02:43 AM Thread Starter
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Hey guys, thanks for all the input. I got a few used relays from my mechanic to try out. New relay not available locally. The engine does suddenly shut off and then restarts without any trouble, I don't think I can hear the pumps, at this point I'm just trying to coast to the shoulder. I'm hoping the relays from the mechanic will be fine otherwise I will go the wire route to rule it out. I hope it's no the CPS.
I don't see any date stamps on my relay or the ones I got from the mechanic.
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post #9 of 15 (permalink) Old 05-16-2019, 03:02 AM
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The relay your about to fit must have the same number as the one your taking out .

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post #10 of 15 (permalink) Old 05-16-2019, 03:16 AM Thread Starter
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My car currently has the 003 545 00 05.
I got four compatible part numbers from the EPC, screenshot attached.
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