Treeri Posted May 14 Share Posted May 14 Hello, I am seeking suggestions or concepts. I purchased a non-functional E60 vehicle with low rail pressure codes. I examined the low pressure and found that it was consistent at 6 bars at the high-pressure fuel pump (HPFP). In order to address the issue of leaky injectors, I conducted a leak test by examining the fuel return system. I found no evidence of gasoline leakage. Additionally, I removed the fuel lines leading to the injectors to verify that there was no fuel seeping into the cylinders. I confirmed that there was no fuel present in the rail. I acquired a previously owned high-pressure fuel pump (HPFP) that has both the control valve and fuel pressure regulator positioned at the rear of the rail, as a precautionary measure. Despite replacing all the components, there is still no pressure being sent to the rail, with a maximum of around 120 bars. Subsequently, I proceeded to disconnect the gasoline line from the high-pressure fuel pump (HPFP) to the fuel rail, and saw that there was no pressure present. Therefore, I am left with either three malfunctioning high-pressure fuel pumps (HPFPs) or two control valves located in the rear of the HPFP. Do you have any suggestions or thoughts? The automobile ignites without any difficulty while using brake cleaning. From my perspective, the electronic control unit (ECU) lacks the ability to hinder the flow of gasoline from the high-pressure fuel pump (HPFP) to the fuel rail. Thank you in advance for any valuable insights. Quote Link to comment Share on other sites More sharing options...
johnnyb44 Posted May 14 Share Posted May 14 HPFP stands for High-Pressure Fuel Pump, which is exactly what it sounds like. Quote Link to comment Share on other sites More sharing options...
Treeri Posted May 14 Author Share Posted May 14 Although my opinions remain unchanged, I find it concerning that there have been three instances of malfunctioning pumps. Quote Link to comment Share on other sites More sharing options...
Ken_Lion Posted May 14 Share Posted May 14 The high-pressure fuel pump (HPFP) is controlled by the DDE (Digital Diesel Electronics) system. Therefore, it is advisable to consider the possibility of a problem with the DDE. Have you inspected the DDE box for any signs of water damage? Quote Link to comment Share on other sites More sharing options...
Treeri Posted May 14 Author Share Posted May 14 However, when the valve is unplugged, it should naturally be at its full capacity, correct? Quote Link to comment Share on other sites More sharing options...
Treeri Posted May 14 Author Share Posted May 14 However, there are no indications of water in close proximity to the electronic control unit (ECU). Quote Link to comment Share on other sites More sharing options...
johnnyb44 Posted May 14 Share Posted May 14 If the pumps are sourced from a circuit breaker, then it is feasible. I have seen someone disposing of a vehicle when the fuel pump malfunctioned, illustrating the unpredictable nature of such situations. Quote Link to comment Share on other sites More sharing options...
Treeri Posted May 14 Author Share Posted May 14 It is necessary. Yesterday, I took the pumps to a nearby Bosch expert for a more conclusive assessment. Quote Link to comment Share on other sites More sharing options...
johnnyb44 Posted May 14 Share Posted May 14 Please provide us with an update on the progress. Quote Link to comment Share on other sites More sharing options...
Treeri Posted May 14 Author Share Posted May 14 I have successfully repaired the pump. Despite the presence of 400 bars of pressure at the rail, the engine fails to start. The fuel is not being delivered via the injector return. Is the DDE failing to provide the injectors with the signal to initiate combustion? What is the optimal voltage for the injectors? Quote Link to comment Share on other sites More sharing options...
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