Date registered: Jun 2019
Vehicle: 1984 500SL
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500SL 1984 Help/General Question
I recently purchased a 1984 500SL from a friend of mine.
I've been working on it gradually trying to get it back in running order, however I seem to have hit a snag.
A few weeks ago a friend of mine and I attempted to turn the car over. The engine would crank, however would not ignite. We injected ether into engine and did get the engine to turn over but it would not run when we cut off the ether supply. We checked the fuel supply line to the injector housing and discovered that there was "old" gas as far up the fuel system as the injector housing. (The car was improperly stored and as a result there was roughly 7 US gallons of gas left in the tank while the car was stored, I have since emptied the tank, added in fresh gas and some B12 Chem-Tool to break down any lacquering in the tank as recommended by my mechanic.)
However upon checking the fuel pump, when turning the key we noticed that the fuel pump would not turn on. We checked the voltage and got no reading on the positive terminal.
I've changed the fuses and the battery. And ordered a new replacement fuel pump, filter and fuel pump relay.
I know from looking around under the car where the fuel pump, filter and accumulator are located, however I am having trouble locating where the relay control unit is located. I've seen conflicting answers and photos online, some have said behind the glove box, someone else told me somewhere under the hood, near or around the firewall.
Any assistance or answers that anyone could provide would be greatly appreciated.