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6.4 Diesel High Fuel Rail Pressure

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Old 08-23-2011, 08:56 PM
rcclracing rcclracing is offline
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Unhappy 6.4 Diesel High Fuel Rail Pressure

Everything I've read about this problem is bad and costly.. I have a 2008 model F250 with the 6.4 diesel. I got this code just before my last fuel filter change about 10,000 mile back.. I also started getting the repeated Water in Fuel, Drain Seperator. I did this over and over nothing I done helped. Called the dealer and he said it would need to be taken apart and cleaned. Just before a trip I changed my fuel filters and again the engine light came on, same code High fuel rail pressure. Of course not only did I have the code but I did not tighten the bottom filter properly and the truck sucked air and shut down.. Got it to the dealer and straightend out the filter cleared the codes and started the 320 mile treck. 100 miles into everthing the code came back and of course like the other times the truck went into a lose of power mode. It seemed to die around 2200-2500 rpm's. We made it back and the truck seems okat except for the code. I checked the engine oil and it seems normal. I did notice the truck used about 3 miles per gallon more instead of 18mpg it was more like 15.. Anyones thoughts!
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Old 08-23-2011, 09:51 PM
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Old 08-23-2011, 10:17 PM
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Quote:
Originally Posted by rcclracing View Post
Everything I've read about this problem is bad and costly.. I have a 2008 model F250 with the 6.4 diesel. I got this code just before my last fuel filter change about 10,000 mile back.. I also started getting the repeated Water in Fuel, Drain Seperator. I did this over and over nothing I done helped. Called the dealer and he said it would need to be taken apart and cleaned. Just before a trip I changed my fuel filters and again the engine light came on, same code High fuel rail pressure. Of course not only did I have the code but I did not tighten the bottom filter properly and the truck sucked air and shut down.. Got it to the dealer and straightend out the filter cleared the codes and started the 320 mile treck. 100 miles into everthing the code came back and of course like the other times the truck went into a lose of power mode. It seemed to die around 2200-2500 rpm's. We made it back and the truck seems okat except for the code. I checked the engine oil and it seems normal. I did notice the truck used about 3 miles per gallon more instead of 18mpg it was more like 15.. Anyones thoughts!
First, welcome to FTE!!!

Sorry to hear about the problem, this is likely an expensive fix. Are you still under your 100,000 mile engine warranty? I sure hope so...

Short of the obvious like a bad pressure sensor the culprit is likely your high pressure fuel pump or one of the control valves mounted to it. These aren't serviceable independently, and therefore you will likely need a new HPFP. This is not a cheap repair...

I'd say get it to a competent dealer ASAP.
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Old 08-24-2011, 05:48 AM
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Sounds like either you have a code reader or a tuner? Be sure to remove those before you take it in for diagnosis.

I agree with Tom. It could just be a sensor but I would lean towards an issue with the HPFP myself.

to do the HPFP they will remove the cab so it will take a few days.
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Old 08-24-2011, 07:58 AM
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Unfortunatley the truck is nolonger under warranty, it has about 132,000 miles. I work at a body shop and removing the cab shouldn't be a problem. Is removing the HPFP a job or can a shad Tree do this? Also in talking with some other large truck Machanics they asked was the pump rebuildable? Good question. I've shut the truck down and it's sitting currently. Fortunatley I have a beater I can drive. I've also heard that you have to take the injectors and fuel lines loose and look for metal shavings. Is this the case?

Thanks,
Broke and Hurting
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Old 08-24-2011, 08:36 AM
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Best to purchase the workshop manual.

Yes you should look at a few of the injectors and your fuel filter bowl ontop of the motor for evidence.

Some of the fuel lines are not reuseable once you take them apart.

Pump is not rebuildable.

You could do the job if you can take the cab off.
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Old 08-24-2011, 10:41 AM
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Can you look at your rail pressure at idle? 5,000 ish is where mine idles and with I was having HPFP issues it was stuck at 8,000+
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