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Old 12-31-2016, 03:57 PM
Join Date: Aug 2010
Location: Boston, ma
Posts: 499
kevinkay is on a distinguished road
ASAP - fuel filter, is blue - in or return?

On the inlet side of the fuel filter, there are 2 fuel lines, BLACK and BLUE.

I mixed them up
I read that the black is the return but just saw a photo where the blue is return??

The out side is easy, blue and vacuum.

2004, X5, 3.0, 202k+
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Old 12-31-2016, 05:41 PM
Join Date: Aug 2010
Location: Boston, ma
Posts: 499
kevinkay is on a distinguished road
Blue is the "RTN" (center connection)
Black is the "IN"

I pulled up the back seat and checked the lines at the pump, Black at the elec. pump and blue at syphon side.
Also found this photo:

Maybe this will help someone else that wasnt paying attention when pulling off the lines......
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2004, X5, 3.0, 202k+
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Old 06-01-2021, 08:19 AM
Join Date: Oct 2017
Location: London
Posts: 105
svvg is on a distinguished road
That’ll be me then. Thank you!
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