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  1. Rupert8

    Return line question

    And again, thank you for the clear explanation. Getting it done as soon as I can.
  2. Rupert8

    Return line question

    Thanks. Right - but mine also seems to have a steel line coming directly from the injection pump, which would appear to be eliminated in this setup unless I'm mistaken. Based on @IDIBRONCO, think I'll just leave it be. Makes sense.
  3. Rupert8

    Return line question

    So this just eliminates the return line from the injection pump or am I missing something here? Just the back two injectors return to the tank?
  4. Rupert8

    Knocking after injector change

    Sorry for the slow reply. I'm about to change out the olives (I set up another thread to ask about how to approach that). I'll report back. Thanks.
  5. Rupert8

    Return line question

    Golden. Thanks for the clarity. Is there any way to replace that steel line and fitting with rubber hose? Wondering if heat from the engine is an issue for rubber hose, though, given where it's located. Aha! I was just looking at the hard line between the fuel filter and the injection pump...
  6. Rupert8

    Return line question

    Thanks so much. Perfect. I found some at Russ Repair and just ordered them, two different sizes. I'll just replace the one at the back of the engine since that is really wobbly. And go from there....
  7. Rupert8

    Return line question

    Thanks. Regarding the return line to the fuel filter, just cap that at each end? Any chance of air then making its way through the injection pump? That wouldn't be good. Or building pressure elsewhere?
  8. Rupert8

    Return line question

    No - I didn't, thanks. Totally missed that. It will be checked out this weekend, or before if possible. Great info! I'll check this too. I need to research what an olive seal is but I don't doubt that this forum has that somewhere! No! It has an after-market one. Thanks. I've heard these are...
  9. Rupert8

    Return line question

    Thanks, yes, I see your point. I'm wondering, though, if air can get in at this apparently loose spot when the engine is off then maybe it is bubbling up to the highest point, which is likely the air filter? The truck runs fine when it's going, but is hard to start and each time it's hard to...
  10. Rupert8

    Return line question

    Hello, Still trying to find the source of air intrusion. O-rings etc all replaced. New return lines..... When I leave the truck for more than a few hours there is air trapped up in the air filter - when I bleed it only air comes out for a while. My question: The steel return line connection...
  11. Rupert8

    Knocking after injector change

    Air intrusion. Right. We'll, I replaced all the fuel return lines recently. Where else are common points of ingress? I'll look into that.
  12. Rupert8

    Knocking after injector change

    Thanks for the information. So may I ask what the common indicative symptoms of a failing fuel injection pump are? It sometimes struggles to start when it's warm (but not always...). It is currently struggling to start when cold, which is new. Used to fire up first or at most second try in all...
  13. Rupert8

    Knocking after injector change

    Hello, sorry for the slow reply. I was waiting a while to get a clear picture of where things stood and, well, you know.... But the new injectors are functioning fine. It's been a few months now since they were installed. That's the good news. The bad news - it's having a hard time starting...
  14. Rupert8

    CDR valve - what is this part?

    Thanks. Was this on a 6.9? I tried yesterday and while the existing metal tube just slots right into place, the rubber one (ribbed part) won't fit down inside the valley pan, and didn't seem to want to go any other way. My metal tube is in good shape, happily, so I'm using that, but curious...
  15. Rupert8

    CDR valve - what is this part?

    Thanks. Does it replace the existing metal tube or go inside it? (Yes, stock placement.)
  16. Rupert8

    CDR valve - what is this part?

    Hi, What is the part circled in the photo? It's made of rubber. Going to replace the llarge 'O' gasket (also pictured) on my CDR valve but not sure what to do with the other part in the kit I bought. The CDR currently has a small o-ring going into the metal tube which then goes down into the...
  17. Rupert8

    Changed CDR valve and now trouble...

    These runaway engines tales are like the best bedtime stories. And my takeaway from all of these is to cut the air supply in the case of one happening. Small chance of it happening, but valuable knowledge.
  18. Rupert8

    Changed CDR valve and now trouble...

    Fascinating. So we are talking about removing the air filter and blocking the air intake at that location? (All done while the engine is running very fast?)
  19. Rupert8

    Changed CDR valve and now trouble...

    Ok. This is embarrassing. Rechecking under the hood, I found a vacuum hose had somehow gotten stuck under the throttle assembly, holding it open, and making the truck rev. A lot. Thing is, humiliating as this is to write, I have no idea how it got under there. I didn't go under the hood after...
  20. Rupert8

    Changed CDR valve and now trouble...

    Hello, I recently posted a separate thread regarding changing out the CDR valve on my 1986 F250 6.9. Job done, and the truck ran fine yesterday, ran very well, even, with the new CDR valve installed. I went to start it this afternoon and it turned over for a long time and just wouldn't start...
  21. Rupert8

    CDR valve replacement question

    Got it. Much appreciated once again. I'm reusing the metal tube and will replace the gromet when it arrives.
  22. Rupert8

    Oil pressure sensor location...

    Ok, so I poked around... The valve cover areas (driver and passenger side) both look dry, which is great. I pulled off the cover under the bell housing and there is some oil in there - but not a lot. What is there is on the passenger side. But certainly less than I was expecting to see...
  23. Rupert8

    Oil pressure sensor location...

    Fully understood, Old Goat. The problem isn't the reading of threads late into the night it's then grabbing a flashlight and finding myself under the truck at all hours checking out what I've just read.... Great information, thank you. I won't have time for a while but I'm going to look into...
  24. Rupert8

    Oil pressure sensor location...

    Thanks. Not sure I'm liking the sound of leaks at the valve cover or rear main seal.... Is that common on these engines? Needing immediate attention? I'll swear it didn't leak at this location before I changed the oil. Is there an additive which might help as a temporary 'band-aid' until I can...
  25. Rupert8

    CDR valve replacement question

    Thanks. I'm learning a lot here for the first time. Would that be the 'standard' position for the CDR valve on a 1986 6.9 IDI? The longer plastic piece would go inside the metal tube?

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