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My thought is HPFP control is going bad. The fuel pump puts out more or less pressure/volume to the rail based on demand. The Fuel Volume Control Valve is located on the HPFP and cannot be replaced separately. Either you have a bad connection at the HPFP or the control valve on the HPFP is bad.
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RRT
E92 335i/6MT with stuff and things
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