PeachParts Mercedes-Benz Forum - Large bubble in fuel line. Concern?

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uberwgn

03-08-2007 09:25 AM

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.

http://img183.imageshack.us/img183/9524/bubblevg6.jpg

Thanks.

C Sean Watts

03-08-2007 12:58 PM

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.

TMAllison

03-08-2007 01:11 PM

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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