'12 F250 P2291 ,NO START,HELP! - Ford Powerstroke Diesel Forum
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post #1 of 37 Old 12-11-2016, 06:08 PM Thread Starter
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'12 F250 P2291 ,NO START,HELP!

I have a crank and no start condition with P2291.The truck has 177K miles (highway)
The fuel rail pressure sensor shows first 350psi at KOEO then decided to replace it with a NEW sensor and now
shows 0 psi at KOEO. While cranking still shows 0 psi .I put back the old sensor and again shows 350 psi at KOEO and cranking . Looking at the Commanded Fuel Pressure it changes from 4,300psi to 6,000psi.
Any ideas what is happening ?
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post #2 of 37 Old 12-11-2016, 06:57 PM
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Does the fpl pid change from low to not low with the key on?

The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark.
-Michelangelo
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post #3 of 37 Old 12-12-2016, 08:56 PM Thread Starter
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Quote:
Originally Posted by kaya View Post
Does the fpl pid change from low to not low with the key on?
Yes, the FPL PID changes from LOW to NOT LOW when commanded from the scan tool .
Also,I did a few more tests today :
1.Took a fuel sample of the high pressure fuel rail and I could see on the bottom
of the black spray cap some very,very fine(almost dust ) metal particles
2.Replaced the fuel pressure regulator (FPR) - the old one had a little rust on it
3. While cranking the fuel rail pressure was going from 0 to 115psi and when the cranking stopped
it went back to 0 psi.
4. Pinched the injectors return line - made no difference in the pressure either with KOEO or cranking
5. Unplugged the FPS and the PCM defaulted to 31,200 psi - again no start
The Lift pump is NEW and the engine mounted filter has been replaced.
Is the HPFP gone already or there is some massive leak which prevents even to build up any minimum pressure with KOEO?
Any additional tests I should try ?
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post #4 of 37 Old 12-12-2016, 09:45 PM
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Is p2291 the only code present?
Can you post a clear pic of your fuel sample please?

The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark.
-Michelangelo
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post #5 of 37 Old 12-13-2016, 06:49 AM Thread Starter
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Here are the samples. Yes, there are two codes: P2291 and P2539 (Low pressure Fuel system Sensor Circuit) The second one showed up immediately after replacing the High pressure sensor .I don't know why.
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Last edited by ioang26; 12-13-2016 at 05:14 PM. Reason: Missed text
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post #6 of 37 Old 12-13-2016, 06:54 AM Thread Starter
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A little better pic
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post #7 of 37 Old 12-17-2016, 07:04 AM
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Doesn't look good for your HPFP...
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post #8 of 37 Old 12-17-2016, 07:16 AM
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Would be awesome if this was your problem....

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post #9 of 37 Old 12-17-2016, 10:29 AM
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Quote:
Originally Posted by ioang26 View Post
A little better pic
That doesn't look like it would cause 0 pressure.
Check supply pressure with a gauge. Should be roughly 80 psi.
If that's good, check for aerated fuel using a clear line

The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark.
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post #10 of 37 Old 12-17-2016, 10:36 AM Thread Starter
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Where should I install the clear line to check for aerated fuel? At the fuel return line at the back of the rail? If that shows positive what would that point to?
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