Rojoires Posted May 21 Share Posted May 21 A new fuel pump has been installed, however, it is still not functioning. The battery has been fully charged, but, only a voltage of 10.4 volts is being seen at the fuel pump feed. Examined the Tyco blue relay (with 4 spade connectors) located in the white fuse/relay box. When supplied with electricity, it produced an output voltage of 12.6 volts. Is the fuel pump supplied with fuel from the Fuel Control Unit? Are there no diagrams included in the Haynes manual? If anybody has any guidance or recommendations, it would be much appreciated. Thank you in advance. Quote Link to comment Share on other sites More sharing options...
Rojoires Posted May 21 Author Share Posted May 21 It may be wise to mention that the radio malfunctioned the day before, with no display but the ability to eject and play CDs. This issue might potentially be connected. Quote Link to comment Share on other sites More sharing options...
badgx Posted May 21 Share Posted May 21 Which vehicle model, age, and engine type? Quote Link to comment Share on other sites More sharing options...
Rojoires Posted May 21 Author Share Posted May 21 The car is a 2010 320d M Sport with automatic gearbox. Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted May 21 Share Posted May 21 Inspect all earths/groundings. Quote Link to comment Share on other sites More sharing options...
Rojoires Posted May 21 Author Share Posted May 21 Greetings, IrvesBMW. Thank you for responding. I will return with the vehicle over the weekend. I am now harbouring doubts regarding the earthing point located above the EPK FCU. That will be my first focus of investigation. Are there any further problematic areas that may be examined as well? Quote Link to comment Share on other sites More sharing options...
badgx Posted May 21 Share Posted May 21 The gasoline pump is not equipped with a separate relay. Instead, it is regulated by the EKP module using a Pulse Width Modulation (PWM) signal. The relays are mostly used for activating the DDE power supply. What is the voltage input to the EKP? Quote Link to comment Share on other sites More sharing options...
Rojoires Posted May 21 Author Share Posted May 21 Greetings, badgx. Thank you for the information. I will be apart from the automobile until the weekend, but, I have a few tasks to do and evaluate once I return to it. Do you believe that a 10.4V output is questionable, or might it just be the result of the usual pulse width modulation (PWM) reading? The diagnostic technician saw the presence of electricity throughout the scanning process using an OBD reader and concluded that my battery could be depleted, however this was not the case. I need a reliable source of grounding and then examine the power supply to the fuel pump. I suspect that the brown ground wire located above the EKP is the cause of the issue. Upon returning to the automobile, I will assess the input voltage of the EKP module. Quote Link to comment Share on other sites More sharing options...
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