Is your tank low (less than 1/2 full) and are you parked with the nose up by chance?

The most likely cause of what you are describing is the fuel system has lost its prime due to a failure in one or more o-rings. Most likely culpret is the pre-filter o-ring. This becomes a problem when the tank is less than half full and/or the car is parked nose-up.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz