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Old 03-08-2007, 08:25 AM
uberwgn's Avatar
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Join Date: Jul 2005
Location: New England
Posts: 979
Large bubble in fuel line. Concern?

subject car: 1999 E300D

I've noticed this bubble in the fuel line just before the pre-filter. It doesn't appear to be causing any operational problems. Is it a concern? It seems like it's getting larger as the months pass.

1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"

Last edited by uberwgn; 03-08-2007 at 08:38 AM.
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Old 03-08-2007, 11:58 AM
C Sean Watts's Avatar
Join Date: Mar 2006
Location: NC
Posts: 1,318
Any leaks at

the lift pump or upstream of it? Best guess = somewhere in that neighborhood is a small leak drawing in air that may, or not, seep fuel.
1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!
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Old 03-08-2007, 12:11 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,869
Tom - The line leading from the fuel heater/thermo to the pre-filter should drain back at shutdown. Thats normal.

If air is present while running one of those two orings or the pre-filter oring are leaking.
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
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