- posted
17 years ago
fuel pump cut-off
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- posted
17 years ago
I have an '86 420 sel that had an alerm issue that caused teh alarm to go off while driving (fun). I solved this by disconnecting the factory alarm. There are two connections that need to be removed under teh passenger floor mat. A quick google should point out the correct ones to pull. I would think it would address your issue as well.
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- posted
17 years ago
I don't know about the 85 500SEL EURO but on my 84 500SEL US car, the fuel computer in in the right kick panel and the unit under the plastic panel on the right side floorboard is the alarm system. You should be able to disconnect but the automatic trunk lock will not work. I think the door locks will still work. I had your exact problem of the fuel pump not starting and it was the fuel pump relay. I would take it out, jump the fuel pump, get the car home, reinstall the fuel pump relay and all was well until the next time it happened. It was a bad solder joint in the relay. Resoldered and every thing has been fine. That was about 5 years ago. Next time it happens, just tap on and move around the fuel pump relay and see if it will start. If it does, fix or repair the relay.