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Old 04-19-2004, 11:36 AM
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Join Date: Nov 2002
Location: Nebraska
Posts: 58
No fuel

My 1975 450 SL will not start. It cranks good, so I checked the fuel at the injectors and found I am not getting gas into the engine compartment from the fuel line. I think in the past when I turned on the ignition key I could hear the fuel pump pressure up (I could be dreaming here as I don't know for sure as it has been awhile) and now I cannot hear the pump. I checked the fuel pump fuse and it is OK. I loosed the clamp on the outlet of the fuel pump and fuel started dripping out so I tighten it back up. I then removed the two wires attached to the fuel pump and turned on the ignition switch to check for voltage and had none. Looking at my Chilton's repair book it mentions a "fuel pump relay" however I can't seem to find that. Does anyone know where the fuel pump relay would be or have an idea where else to start checking?

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Old 04-19-2004, 09:23 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I believe the relay panel is under the passenger side kick panel in front of the door on the 450, or maybe under the driver's seat (or is that the ECU?)

If behind the kick panel, the relay is the top one on the "short" side (forward, I think).

Check the master relay, too -- the one below it. If that's bad, no fuel injection at all.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 04-20-2004, 12:20 AM
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Location: near Scranton, PA
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Don't know about yours but on my 4.5, there's 2 wires on the (+) terminal for the battery - the thin one is for the fuel pump relay.
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Old 04-20-2004, 11:24 AM
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Join Date: Nov 2002
Location: Nebraska
Posts: 58
No fuel

Thanks for the info. I will check into it and with some luck be driving again soon.

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