So about a month ago had my HPOP go out. Got it all replaced and back on the road. About 2,000 miles since this i now have 4 injectors out.

Injectors 2, 4, 6 and 3. 3 is by far the worst on the bubble test. Injectors 2 and 6 bubble very little but none the less still bubble. One interesting fact injectors 2 and 6 were replaced by the previous owner at 148,000 and are not motorcraft. I have almost 200,000k on my truck now.

Just curious if this is just bad luck or something else.

 

How are you isolating exactly what injector is bubbling? The bubble test would imply you have exhaust gas entering the fuel rail.
Yes a bad pump can kill injectors but not this way.

 

This is more a lift pump failure result, not a hpop.

 

Probably pulling glow plugs.

 

Correct pulled all the glow plugs and one by one went through each cylinder. While I am not a pro #3 was bubbling like a hot tube and I would bet caused the rough idle and me to stop driving it as soon as I noticed it which was less that 1 min as I was luckily 2 blocks from by house.

Injectors 2 and 6 only produced a few bubbles but there should be none. 4 did a little more but nothing compared to 3. You had to crank a bit to get all these to bubble.

The few bubbles I am seeing on 2, 6 and somewhat 4 caused by the spool valve sticking(stiction) or something else? Just want to make sure I understand it so I can do my best to make sure I can prevent it from happing again.

 

Either a failed copper sealing washer or a failed injector. You will know if the copper h as failed usually the oring closest to the cylinder will be shreaded.

 

Check the holddowns for correct torqe values

 

Will do that. That would be great if that was the case on a few of them.

Only thing is the 2 injectors that I know have been replaced if they were not torqued properly I would think they would have burned out the copper gaskets and o rings long ago as it it has be 50k miles and several years later? Always thought if the copper washer was not sealed it would act up rather quickly.

Thanks for all the help.

 

I checked all the bad injectors torque and they were right were she should be 24 ft lb's. Went ahead and pulled them and all the seals were intact.

New twist. So the only place I fill up is at my office. The same week my injectors went out one of our F450 6.7 blew its HPFP and the dealers diagnoses was there was fuel in the diesel that caused it to fail. We also had a Case Back Hoe lose its HPFP same week and they also said there was gas in the diesel as well. The backhoe uses a different tank as it is offroad but same fuel provider. I have pulled a sample from my truck to have it tested.

Will wait for the test but this could have taken out the injectors correct? Just seems unlikely I would lose 4 at once. I had driven 70 miles since I had filled up.

 

If you can light a small puddle of it on fire with a match it has gas in it..... dont burn yourself.

 

That was the first thing I did. Did not burn. To be honest does not smell or look any different. Just odd within a week we get 2 failures (not counting mine) that were blamed on gas in the diesel.

I guess at the end of the day it does not change the fact that need to order 4 new injectors.

 

One more thing I found was on injector 4 the bolt and nuts that hold the spool very were very lose. I would bet it would have come apart over time.

I am thinking of moving the one good injector on the driver side to replace injector 3 on the passenger side. That way the entire bank on driver side will be new. In theory that side will be good for a long time. In the future I will replace the passenger side bank when they start acting up. Makes sense in my mind.

 

So I replaced all the bad injectors. I moved the one good injector on the driver to the passenger side so now driver side has all new injectors and the passenger side is all original.

Truck fired back up and runs fine. I had been babying it as I was waiting for a fuel pressure gauge to come in so I could go though the truck and rule out low fuel pressure. Got the gauge all hooked up to today and just getting took it for a spin. Pressure dropped below 40psi with spirited acceleration. New fuel pump on the way and it is parked again. At idle saw pressure as low as 40psi as high as 55psi. Did not want to hold constant.

One thing positive is my boss has a 07 F250 6.0 he has let me use thru this whole ordeal so I have been able to take my time and do it all correct and not be rushed.

 

Have you installed the blue spring kit in the fuel pressure regulator?

whoops, just read your signature....Nevermind