Looks like this:

Pump is on left, filter in middle, accumulator on right.
As you can see, there are several fuel lines involved.
If you can avoid it, the accumulator is pretty expensive.
The worst part of the job is all of the fuel that spills on your head, even if tank is drained.
I also had a lot of trouble removing the banjo bolt on the backside (which you cannot see in image).
Get a Bosch pump. Do not be tempted by the Tawain special at Autozone as I was, since it is very noisy. Works ok otherwise, but not a good way to save $40...

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1986 300E 5-Speed 240k mi.