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P3090 OBD code, 525i Petrol, 2007

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I have been getting this OBD code intermittently recently. It happens when I accelerate the car (e.g. when moving away from a toll booth on the motorway) or when accelerating gently. When I park the car and restart it (e.g.next morning) the code is cleared and the engine runs fine, until the next time it happens.

The manual says P3090 29F2 'Fuel rate pressure flow rate controlled, Fallen below minimum pressure'. Is this a fuel pump problem?

Thanks you for your help, I really appreciate it.
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