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Old 05-12-2002, 05:35 PM
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fuel pump relay

I got the new fuel pump relay for my 560 sel from fastlane and it cured the problem for a while. I drove it once to the gas station, and I ran it a few other times (waiting for paperwork to clear up registration problems), and the last time I ran it, it died and never started back up-fuel pump out again. I jumped out the fp relay and it started up. Do the new relays have reliability problems as well? What now? Thanks,
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Old 05-12-2002, 09:14 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
No, usually not. It sounds like your fuel pump(s) could be drawing too many amps and blowing the relay like a fuse.
Donnie Drummonds
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Old 05-13-2002, 10:49 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Also the ignition module must send a VOLTAGE signal to the TD pin on the fuel pump relay so that the relay knows that the engine is running.
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Old 05-13-2002, 05:43 PM
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I have got to go with Benzmac on this one. That was the problem I had with my 500SEL. Take it from me, do not buy cheap crap to replace the fuel system components with. I repeated that montra as I was replacing my third fuel pump.
R. Downs
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