In the photo, #5 is the fuel line and it connects to the accumulator which is either #2 or #57, depending on how you look at it. For sure, the line has to come off.

I went thru is last spring when my 126 300-SELs fuel pump gave up the ghost.

While I was at it, I replaced virtually everything in the area: pump, accum, filter, hoses, tank strainer, etc.

There was a "special" hose about a foot long that I had to order from an MB dealer. None of the WEB sellers showed it in their online catalogs. I want to say it's #35(black hose) in the photo. Other types of hose just didn't fit right.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"