Location of Fuel Pump Relay on 1978 450SL

[jnanasakti]

I have a 78 450SL and as is common with the 107, I'm having troubles keeping the car running once it's started; some type of fuel system related issue. It starts but loses power after about 1/2 hr. If I drop it into neutral at stops, it retains power. Even with the neutral technique, it dies out after about an hour.

My current situation is to replace the fuel pump relay, but I cannot locate it. Does anyone know where the fuel pump relay is located on a 78' 450SL?

Here is a picture of my relays and a picture of the fuel pump relay I bought from a dealer. I cannot locate this relay anywhere. I was told it is not in the picture (on another forum) but there is no other relay in this area of my car. Any help is appreciated.

A picture of my relays.

A picture of the fuel pump relay I got from my dealer.

And there is a relay that matches the size but not color of my replacement relay in the first picture. In the middle left of the picture is a silver relay which has has 5 pins but doesn't state voltage and such as my replacement.

 

[mattkh]

Hi
Can you hear the fuel pump prime every time you turn the ignition on.
If you can then, take one relay out at a time and see if the pump does not prime, and that should be the one.
In addition, make sure it has the same number of pins.

What are the six numbers after WDB of the chassis number.