Breaking Habits
New member
For what its worth.. When I got to JD's shop, my airdog was pushing 50 PSI to both of my pumps and neither leaked.. So its not always going to leak. BUT, my 2009 had 8 PSI and leaked horribly. Im with Nathannial's point.
Modified 6.4 - Air in Fuel - 7 wks without truck - please help
- Thread starter MT_Diesel
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sideactiondiesel
Member
:fustrate:
Just to clarify I am not talking about the HPFP lines. I am talking about the lpfp feed to the second k16.
It ran for a while without problem... It would be fine until the aerated fuel feeding the other k16 got hot causing metal to go into the system which caused the 2 injectors to go down.....
Make sure the feed from the LPFP is feeding the correct port on the added K16 pump and return is the correct return on the HPFP.
Let me know what you find .
Just to clarify I am not talking about the HPFP lines. I am talking about the lpfp feed to the second k16.
It ran for a while without problem... It would be fine until the aerated fuel feeding the other k16 got hot causing metal to go into the system which caused the 2 injectors to go down.....
Make sure the feed from the LPFP is feeding the correct port on the added K16 pump and return is the correct return on the HPFP.
Let me know what you find .
powerstroked08
Active member
Definitely keep us updated on this! I think a lot of guys would benefit from any info on the reman pump fixes!
MT_Diesel
New member
Sorry for the delay, hope everyone enjoyed their Memorial Day weekend.
Here is the fuel system schematic I drew up. I obviously modified the one from the 6.4L Coffee Table book but this gives you the gist. The dealer mechanic said he couldn't begin to figure out the fuel system. I spent 10 minutes with a fiber optic camera (and knowing very little at all about the factory system) and had it mapped. The only uncertainties I have with the diagram are the internal routing of the elite fuel bowl delete (and whether it comes with the pressure regulator - perhaps Nathaniel can chime in), and the 2 high pressure outlets on the factory K16 - I may have gotten them switched but 1 definitely goes to left bank and 1 goes to high pressure out on belt driven K16.
Air in fuel only seems to be affecting left bank. I don't think dealership will be able to isolate pumps, not sure if another place could do that for that matter. It would be a chore to get to the factory pump without pulling cab (i.e. probably not possible). Do you guys see any issues with the routing??
So my thoughts are we will retest low pressure fuel pressure just to make sure the LPFP is keeping up with the HPFPs since it is so easy to do. Next would be to check injector cups unless you guys see a likely culprit in the system routing. Thanks again for all your help!
Here is the fuel system schematic I drew up. I obviously modified the one from the 6.4L Coffee Table book but this gives you the gist. The dealer mechanic said he couldn't begin to figure out the fuel system. I spent 10 minutes with a fiber optic camera (and knowing very little at all about the factory system) and had it mapped. The only uncertainties I have with the diagram are the internal routing of the elite fuel bowl delete (and whether it comes with the pressure regulator - perhaps Nathaniel can chime in), and the 2 high pressure outlets on the factory K16 - I may have gotten them switched but 1 definitely goes to left bank and 1 goes to high pressure out on belt driven K16.
Air in fuel only seems to be affecting left bank. I don't think dealership will be able to isolate pumps, not sure if another place could do that for that matter. It would be a chore to get to the factory pump without pulling cab (i.e. probably not possible). Do you guys see any issues with the routing??
So my thoughts are we will retest low pressure fuel pressure just to make sure the LPFP is keeping up with the HPFPs since it is so easy to do. Next would be to check injector cups unless you guys see a likely culprit in the system routing. Thanks again for all your help!
MT_Diesel
New member
Well I can't get pdf to load properly so I'll have to address that tomorrow.
MT_Diesel
New member
Pdf works, just takes a little time to load.
sideactiondiesel
Member
Cups are not going to have anything to do with HPFP system.
webb06
Active member
But is that not one of the few places are could be getting into the system? If only one side is affected?
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sideactiondiesel
Member
Yes in the return side of things.... but that is not his issue.
White_monster
Active member
Did the new Hpfp get reversed before install?
MT_Diesel
New member
Brenton, would a cracked cup just pressurize the return flow from the heads and not the high pressure part of the system?
White monster, what do you mean by reversed?
To all, does anyone see any problems from the routing in my diagram? Are there any tests that can be done to determine if rail pressure is holding in the left bank since the sensor is in the right bank? Do you see any reason to redo the high pressure tubing if it appears to be hooked up right?
The dealer thinks there are aeration problems because the left bank injectors are randomly dropping out and coming back when running ( individually, not all at once). Should i try to check the injectors more in case it is an injector problem? That side has 2 new injectors and 2 injectors that were just checked at rcd so I wouldn't think that is the problem. If they checked for aeration at the cooler outlet, would it show up there if a cracked cup was pressurizing the return that goes to the cooler inlet?
I'm concerned the issue might be with the factory injection pump since that feeds the left bank exclusively. Is there any way to check the pump short of rerouting everything to just run off the belt driven pump? If we isolate the pumps and run off only the belt driven pump do I have to worry about lubrication to the factory pump?
Thanks!
White monster, what do you mean by reversed?
To all, does anyone see any problems from the routing in my diagram? Are there any tests that can be done to determine if rail pressure is holding in the left bank since the sensor is in the right bank? Do you see any reason to redo the high pressure tubing if it appears to be hooked up right?
The dealer thinks there are aeration problems because the left bank injectors are randomly dropping out and coming back when running ( individually, not all at once). Should i try to check the injectors more in case it is an injector problem? That side has 2 new injectors and 2 injectors that were just checked at rcd so I wouldn't think that is the problem. If they checked for aeration at the cooler outlet, would it show up there if a cracked cup was pressurizing the return that goes to the cooler inlet?
I'm concerned the issue might be with the factory injection pump since that feeds the left bank exclusively. Is there any way to check the pump short of rerouting everything to just run off the belt driven pump? If we isolate the pumps and run off only the belt driven pump do I have to worry about lubrication to the factory pump?
Thanks!
webb06
Active member
You could unplug each pump individually. Undo the front 2 connections and see what happens...then undo the rear plug
That should isolate them
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webb06
Active member
White_monster
Active member
The front pump needs to be reversed for proper operation. The rear cover needs to be removed and the ring flipped. Did this happen?
powerstroked08
Active member
I think you might be on to something Shane.
The elite low pressure system recirculates the return fuel back the the regulator if a cup was broke the air could renter the system there. Crack the line on the fuel cooler and see if you get air.
MT_Diesel
New member
Perhaps Jared will chime in on this. RCD didn't do the work but he is familiar with the truck. I don't know but will try to contact the seller and ask.
MT_Diesel
New member
The dealer did run a test by hooking a clear tube to the fuel cooler outlet while running and said fuel didn't appear aerated.
Breaking Habits
New member
The pump was reverse rotated. I reverse rotated the first pump, the front pump was then replaced a few months before Ryan bought the truck and was also reverse rotated.
78f100
Active member
If it's putting air/compression back into the pump, though it is technically a low pressure issue.
The quote above is why I said a cracked cup could cause the issue, plus I had it happen to me as well.
if the problem is limited to one bank I doubt that is the problem though.
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