Prior to the green fuel pump relay, like the one in Art's picture, the OE fuel pump relay for the 240 with K-Jet was black. This is for '79 and later. '78 and earlier used a different relay and it is not interchangeable with the later one.
If you look closely at the one in your car you will see the Stribel trademark. It looks a little like a dollar sign. See pix below.
There is some internal difference, I forget what exactly, but it functions the same.
When the green relay in my 1980 242 became unreliable I bought a new relay (KAE brand as Stribel doesn't make them anymore) but I keep it as a spare in the glovebox.
What did I replace the green relay with? The black relay from my old '79. It has seen 200k + miles of service and it still works fine.


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'80 DL 2 door, '89 DL Wagon, '15 XC70 T6
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