I recently changed the fuel filter on my '87 260E. It wasn't difficult, all the screws & fitting came off reasonably well with standard wrenches.

However, the flexible hose connecting the filter to the hard lines in the car was an 18 year old, original part. It apparently couldn't take the twisting of removing the connections and developed several pinhole leaks. I got a replacement from Fastlane & swapped it in very easily. I was amazed at how little corrosion there was where it counted. Be sure to use two wrenches, one on each side of the joint. Don't let a fuel line absorb the torque.

BTW, many of the connections use a copper flat washer as a seal. take care to keep these clean, yada yada. New ones come with new filters.

Enjoy,

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Norm in NJ
Next oil change at 230,000miles