It's worth a try workingonit, since you have the filter on hand already.

I did want to properly diagnose my long crank before putting on a check valve and filter, but the fuel pressure gauge I had access to didnt have an adapter that fit the M62 fuel rail, so I went parts cannon on it based on posts here.

I may have to scrounge up a fuel pressure gauge adapter so I can do the tests Andrew is suggesting.

Hope your feeling better and that the filter fixes the problem with your X.

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04 X5 3.0i auto
03 X5 4.6is