Just thought about the above; I used a bottle of Cataclean two days ago, in lieu of my semi-yearly use of Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner. I had been meaning to try Cataclean for some time, since a friend had used some and it helped with his car (2008 Chevy).

I didn't get a chance to drive my X5 the way the instructions said to do, so could there be a chance that the additive dissolved a component in my fuel system?

It's possible that the fuel filter became clogged (with only 7 miles and 15-20 minutes run time), but shouldn't the fuel pump or relay would still try to work?

The only other item I changed, a month or two ago, was a new fuel cap, but it has had no ill effects on the X5 after installation.

Just scattershooting ideas, trying to reason why the sudden failure occurred.

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide