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  1. A

    Low Fuel Rail Pressure

    I believe that the next thing he is going to check is the desired pressure vs actual fuel pressure and return rates. He had done all that on the old engine and he did find that the desired pressure was not there. Then the engine tore up.
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    Low Fuel Rail Pressure

    I did look it up and now I know what it is. I just can't believe that the pump on the old million mile engine, and the one that came on the new 89,000 mile engine have the same problem and show up the same way. I know its possible but not plausible. Same thing for injectors. The only fuel...
  3. A

    Low Fuel Rail Pressure

    What is a CP3?
  4. A

    Low Fuel Rail Pressure

    I'm beginning to agree about the parts changer idea. I just don't see any progress.
  5. A

    Low Fuel Rail Pressure

    Is the FPRV the plug at the rear of the fuel rail on the driver side? I had him replace that with a plug (saw on a video) on the old engine and it didn't help. He said he was going to transfer it to the new engine earlier today when I spoke with him.
  6. A

    Low Fuel Rail Pressure

    Fuel filter is new. The mechanic does have a scanner and he knows those numbers. I don't know if he has tested these on the new engine to date. Today he was checking the vacuum. I thought the pump would overcome any shortcoming in vacuum.
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    Low Fuel Rail Pressure

    That might be my only option, new mechanic.
  8. A

    Low Fuel Rail Pressure

    My mechanic is going back to the engine and running all the vacuum tests and pressure tests that he ran on the old engine. In my mind, it seems like the problem was left on the truck and has just carried on to the new engine. what part on the truck would cause this. Remember, all new fuel...
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    Low Fuel Rail Pressure

    I really thought that when I replaced the entire engine that I would be throwing out this problem and would crank up and run like the wind. What are the chances that the new engine came with the same problems as the old one. Different sensors (on the engine), injectors, pumps.
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    Low Fuel Rail Pressure

    I really don't know.
  11. A

    Low Fuel Rail Pressure

    Hi All, I am new to the group and in search of answers concerning this topic. I have a 6.6, LBZ. Previous engine had over 1,000,000 miles as per the odometer and had constant P0087 code as soon as I began hauling trailer up any incline and of course, lost half power of engine. Engine had...
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