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Old 08-25-2005, 11:00 AM
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Join Date: Aug 2005
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Fuel Pump Relay Problem....Please Help!!!!!!!

FUEL PUMP RELAY PROBLEM.....PLEASE HELP!!!!1983 500sl Euro

I Replaced The Relay Because No Power To The Fuel Pump....

The 7 Pins On The Relay Have 2 That Are Getting Power And When I Turn The Key It Does Not Click Or Make Any Noise...

Could There Be An Ignition Switch Or Somthing That Is Supposed To Activate The Relay....

If So Where Is It Located So I Can Test Or Replace??????

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Old 08-25-2005, 01:05 PM
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My dad had a 380SL many years ago of about that vintage that went through a few fuel pump relays pretty quick. I think replacing the pump ultimately fixed it. The relay was behind the front passenger kick panel. I took one of the relays that failed apart. A solder path had clearly been melted in half. I resoldered it and put it in the glovebox as a spare.

I would power the fuel pump directly and measure the current. It may well be that the circuit allows a current spike to fry the relays before a fuse does. If the fuel pump is one of those Bosch pumps mounted in the tank, I know from my SAAB days that they sometimes draw high current intermittently when they are starting to fail.

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