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It took me a while to figure out that the picture is 90 deg turned to the left and I'm looking at the line running from the fuel heater to the filter assembly.
On my car, there's always a bubble like this when the engine is off. On start up, it disappears.
I believe that the bubble "lives" in the top of the filter housing where it can't move on through the system. Then it reverses slightly into the inlet line when there's no more draw from the lift pump.
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-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
Last edited by KarTek; 01-02-2013 at 10:45 AM.
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