When I swapped fuel filters in my '87 260E, I dropped the "rack" with the pumps and filter in it. Not too much fuel spilled out. I did get an initial pressure spurt, probably from the accumulator. I didn't do any special draining.

Afterwards, the flexible line between the pump and the "hard" lines to the front developed several pinhole leaks right through the side of the hose. I'm guessing because it was old & stiff & couldn't take the bending. It's also possible that I put a twist in the line when I tightened the swivel fitting. The replacement line was a "made up" line with crimped fittings. Fit right in, like it was made to. Worth getting, IMHO.

Several of the fittings use copper washers. New filters come with replacements. Other stuff should, but I don't know if they do.

Enjoy,

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Norm in NJ
Next oil change at 230,000miles