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#1
03-08-2007, 08:25 AM
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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.  Thanks.
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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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#2
03-08-2007, 11:58 AM
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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.
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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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#3
03-08-2007, 12:11 PM
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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.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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