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Old 05-24-2011, 03:40 PM   #1
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08+ Returnless Fuel System

I'm curious to know how in the world the 08+ fuel system works. There is no fuel rail pressure sensor on the 08+. I thought that sensor was the heart of the returnless fuel system. The sensor allows the ECU to calculate the pressure drop across the injectors, correct? So, if that sensor is not there, how is the ECU calculate the pressure drop across the injectors?


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Old 05-24-2011, 08:43 PM   #2
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Interesting ...


Here is what I found for the 2007 and older Duratec:



Verified by a pic of a 2005 Focus Duratec engine:




The 2008+ does not have the sensor, as you said:



Verified:





My thought right now is the sensor was simply moved. I notice the newer cars have an added heatshield on the firewall. Maybe it's back there?

It is possible that they don't have one at all. If you know the duty cycle and flow of the pump as well as the injector duty cycle and flow you can figure out the theoretical fuel rail pressure. The older ECU's did this already. Maybe Ford engineers got enough data they where able to build a flow/pressure map that was perfect, nixing the need for the sensor. But having a redundancy in the system would of been a good idea IMO.
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Old 05-25-2011, 11:36 AM   #3
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Also what I want to know is how there is no "fuel filter" on my 2009.
It's just a screen. Supposed to be lifetime durability.
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Old 05-25-2011, 11:55 AM   #4
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Quote:
Originally Posted by tetra View Post
Also what I want to know is how there is no "fuel filter" on my 2009.
It's just a screen. Supposed to be lifetime durability.
I believe the filters are inside the fuel pump and it is a lifetime filter. the fuel was always filtered twiced anyway going through the sock on the fuel pump then the filter outside the fuel tank.
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Old 05-25-2011, 01:30 PM   #5
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There is no sensor to measure the psi drop across Inj its basicly all dont in the fuel pump assy and they carry much higher fuel psi 56-58 psi

I have never had the chance to have a fuel pump assy out to look it over but guessing there is an inline psi regulator built in

Correct the filter is the sock filter on the fuel pump , kinda silly to have 2 filters

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Old 06-15-2011, 02:05 AM   #6
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I belive tom to be correct. the sensor is in the fuel pump assembly
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Old 10-04-2016, 01:15 AM   #7
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Has this ever been verified - that the the fuel pressure sensor is in the fuel pump assembly? This is the part that fordparts.com says fits my 2010 Focus SE 2.0L (using my VIN to look it up). Unfortunately, there is no diagram showing where this part goes: 2010 Ford Focus Fuel Injection Pressure Sensor | FordParts.com
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Old 11-19-2016, 10:30 PM   #8
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I was never able to 100% find a fuel sensor that is common among the old Foci. From what I understand, the ECU is commanding the fuel pump how much fuel is required for the engine given a certain load. Hence the reason for no PID in Livelink.

To get around this I installed a AEM fuel pressure gauge. The gauge has an analog out. You can add an equation to Livelink to then log you fuel pressure.
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Old 11-19-2016, 10:36 PM   #9
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I ended up removing the tank (not very difficult - easier than cutting a hole in the floor!) and removing the fuel pump module and taking it apart. There was no separate sensor in the pump module, just a pump and a fuel level sending unit - no wires for any other sensor. No other sensor in the tank anywhere. So I agree - the ECU must be modulating the voltage to the pump - strange to not have a sensor somewhere for feedback. I could find nothing in the entire system as far as a pressure sensor, besides the EVAC pressure sensor in the vent line from the tank to the fueling inlet. That sensor was bad, and was causing a code (0452 I believe) before I replaced the 3-ended line and sensor assembly.
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