Im doing a diesel purge on 95 E300D. I have it hooked up with the return line which is the the hose on the left of the three that are there and then also hooked up a hose from the Prefilter.

There is fuel moving in the return line but nothing is moving in the feed line?
Why is this occurring? Thanks

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1994 S350D
1995 E300D
1997 E300D

A picture or diagram would really help.

What do you mean hose 'from the prefilter?' In terms of fuel flow, the lift pump line should draw from the bottle of Purge. Whether that goes through the prefilter is up to you.

Sixto
87 300D

You should only be doing this from the two rubber lines that are attached to the hard lines on the driver's inner frame rail, under he IM.

Those two hoses are such a pita... huge downfall over the ease of access of an OM617...

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'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter

Thanks guys, I discovered a an air leak in the line from the pre-filter. Installed another line and all is good!

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1994 S350D
1995 E300D
1997 E300D

Does this help?

Mercedes 350SDL Diesel Purge / Fuel filter replacement - YouTube

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
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2013 Fiat 500E.