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Ron, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 35523
Experience:  ASE Certs.
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2005 E320 CDI crank,no start. Fuel rail pressure builds to

Customer Question

2005 E320 CDI crank,no start. Fuel rail pressure builds to "running Pressure" but decreases with continued cranking.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Ron replied 1 year ago.

Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

The fuel pressure problem you are discribing can be caused by and of the following

  • Low Fuel
  • Fuel Viscosity — Incorrect fuel viscosity caused by improper fuelblending.
  • Leaking Injectors
  • Incorrect Powertrain Control Module (PCM) Software —Powertrain Control Module (PCM) incorrectly programmed.
  • Malfunctioning Pressure Control Valve — Faulty pressure control valve Y74.
  • Quantity Control Valve — Faulty quantity control valve Y94.

    In order to determine the cause you are going to need to do some testing, I have enclosed the steps in the link below, copy and paste the steps to your browser to open and view them.
Customer: replied 1 year ago.
Thanks anyway, I am in process of pulling high pressure fuel pump to inspect drive, and probably replace pump.
Expert:  Ron replied 1 year ago.

Okay, hopefully that will resolve the problem. Best of luck to your. Thank you as well.

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