BenzWorld Junior Member
Date registered: Sep 2006
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1972 280SE 4.5L fuel pump now doesn't have voltage-looking for diagram
I have been struggling, one step at a time, to get fuel to my fuel rails again. After replacing the gas filter, fuel filter, fuel lines, fuel regulator, cleaned injectors, and now a tired fuel pump, somehow I've lost voltage to my new fuel pump. The old one would hum and then cut off, but I've got no voltage to the leads now. I have no idea how that happened. I do have the wire taken off of the ignition, but I don't believe that it is in the circuit. And, I'm pretty sure the key only had to be in the 'run' position to get the 12V to the fuel pump.
I've read the link from nutz4benz, but I don't have a diagram that shows where the various pins are at to test the fuel pump relay and fuses. Is there a diagram that is available online somewhere? I've looked at all of the fuses in the engine compartment, as well as the fuse in the driver's foot area, and they look fine. I believe that the fuel pump relay is the one closest to the engine wall, but I'm not sure. And, like I said, I haven't seen a good wiring diagram to help troubleshoot.
Any suggestions?? Thanks again everyone for your assistance!