Question about 2000 Ford F350 Super Duty Super Cab

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I have a 2006 F350, 6.0 Diesel that is not starting well

I have a 2006 F350, 6.0 Diesel that was starting rough and sometimes not at all just after I shut it off on a hot day. I was told to replace both fuel filters. After I replaced both filters and ensured that the engine filter had plenty of fuel and cycling the pump on a off a few times, it is now dying within a few minutes of driving it. Then it won't start again for a long while. I refilled the engine filter a couple more times just to make sure I did it right, but no change to the symptoms. Also, the fuel pump, which I think is just next to the lower filter (under driver door) seems to run for 20 seconds every time that I switch the key to "run". Not sure if that is a clue or not. What is wrong with my truck?

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What your describeing sounds like a fuel pressure issue. The only way to confirm is to hook up a pressure gauge to verify. Then if the pressure is low you will need diagnostic procedures like the ones that can be had at mitchell1diy online. There are several seals within the system not to mention sensors. Not knowing what any of these read without a data scanner noone can accurately guess whats going on with your truck. Personally I would not touch this if your new diesels. This really needs to be put in the shop. Also if you have oil pressure issue the truck will also do this, Listening to someone recommned maybe this maybe that is only going to get expensive if you choose to just throw parts at this. You have already paid more for the parts you threw on than a diagnostic would run and you have taken a step backwards which really leaves one confused. But either way if you choose to work on your truck you need the sight I mentioned to proceed.

Posted on Jul 22, 2010

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  • atiefen Jul 22, 2010

    How can I determine if this is an oil pressure issue or not? If this oil pressure was low wouldn't I get an error code on this truck?

  • Susan Price Jul 22, 2010

    if you don't have the tools to diagnose this your going to have to buy them. One tool will cost more than a proper diagnostic so if that tool does not give a positive direction to go then you will be further in the hole. What people don't understand is the hardest part of fixing these newer trucks is the diagnostic part. When the truck was running you should of paid for a professional recommendation, and then decided to fix it yourself if you were capable. But now its anyones guess why it won't start. Once you released the pressure from the system a failed seal or low pressure in the fuel pump could be preventing it from reprimeing. Even if you determined it was a fuel issue several tools are needed to acurately diagnose this. And on top of all this your original problem may not of even been fuel related.

  • atiefen Jul 22, 2010

    I do have a code reader and the only current probelm is a bad EGR valve that I have not replaced yet. I was told that it would not cause an problems with the vehicles operations and was only related to emissions control. There are no emissions regulations in the state where I live so I have put off replacing it. Is this correct or did I get bad information?

    I just went out and read the error codes in the system. It had 12 more codes all related to high and low fuel in various cylinders. I cleared them and the truck is now running for the past ~35 minutes without throwing any more codes. I'm going to let it run a while longer and then test drive it. I may have caused some issues while trying to purge the fuel filter yesterday - hopefully. It was my first time changing out these filters and I didn't purge them the first time. Could this have caused my issues?

  • Susan Price Jul 22, 2010

    yes, any air in the filter would cause a blockage issue, Thats why there is a purge valve. As far as the egr goes if the valve itself is stuck open a little you will have a rough idle. But there are several other reasons a code for a egr will set. One being a DPFE sensor is out of range (failed). The egr passage could be clogged a little also. The code should state low flow or sensor out of range or something to that effect.

    An egr valve should only open while cruising so if its open any other time itwill act like a vacuum leak,, except exhaust gasses are inert. Its dead air. Will not help the burn but will stumble the engine because the 02 sensor cannot sense dead air. An egr's only purpose is to direct spent gasses back into the burn which takes up space and keeeping the engine cylinder temperatures below 2500 degrees. Anything above 2500 degrees cause that yellow haze in the atmosphere, (NOX)



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