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Old 03-08-2007, 08:25 AM
uberwgn's Avatar
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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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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
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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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Old 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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