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  #11  
Old 04-22-2019, 07:28 AM
Witsend Witsend is offline
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Not sure what is in the way on a 6.7 Cummins , but the 5.9 common rail fuel injector leaks can often be visually seen.

https://www.youtube.com/watch?v=z_w8qjxaPL8
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  #12  
Old 04-22-2019, 03:02 PM
BRIAN617 BRIAN617 is offline
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Quote:
Originally Posted by Witsend View Post
Not sure what is in the way on a 6.7 Cummins , but the 5.9 common rail fuel injector leaks can often be visually seen.

https://www.youtube.com/watch?v=z_w8qjxaPL8
I think they're talking about leaking fuel at the nozzle, internal injector leaks.
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  #13  
Old 04-22-2019, 06:44 PM
Witsend Witsend is offline
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Quote:
I think they're talking about leaking fuel at the nozzle, internal injector leaks.
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He mentioned The crankcase is filled with fuel so chances are one is leaking externally under the valve cover. If it was leaking at nozzle the motor probably hydrolock
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  #14  
Old 04-23-2019, 06:30 AM
Matt Matt is offline
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Thanks wit & Brian. I am still chasing this one down.
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  #15  
Old 04-23-2019, 06:36 AM
Matt Matt is offline
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Does anybody know if I can run the 6.7L Cummins with the valve cover off and do a visual like Wits 5.9 video?
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  #16  
Old 04-23-2019, 09:32 AM
Witsend Witsend is offline
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Quote:
Does anybody know if I can run the 6.7L Cummins with the valve cover off and do a visual like Wits 5.9 video?
That video is not my video , just a link to a random public video found on YouTube.
If the problem is intermittent, did you make sure you don't also have an actual issue with the Fuel Rail Pressure Sensor or wiring, and the fuel pressure is just defaulting to some higher than normal level?
Thought I recall in the video of the 5.9 leak the guy unplugged or jumped the FRP connector to intentionally create a higher than normal fuel rail pressure in order to see the injector leakage better.
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  #17  
Old 04-23-2019, 10:25 AM
BRIAN617 BRIAN617 is offline
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Originally Posted by Matt View Post
Does anybody know if I can run the 6.7L Cummins with the valve cover off and do a visual like Wits 5.9 video?
Use UV dye (pour some in the fuel filter) if you think you have leak under the valve cover. Then you wont have to run it with the top off.
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  #18  
Old 04-23-2019, 05:03 PM
Matt Matt is offline
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Quote:
Originally Posted by Witsend View Post
That video is not my video , just a link to a random public video found on YouTube.
If the problem is intermittent, did you make sure you don't also have an actual issue with the Fuel Rail Pressure Sensor or wiring, and the fuel pressure is just defaulting to some higher than normal level?
Thought I recall in the video of the 5.9 leak the guy unplugged or jumped the FRP connector to intentionally create a higher than normal fuel rail pressure in order to see the injector leakage better.
I didn't mean that you made the video Wit, sorry for the confusion. I was just referring to it in generalities.
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  #19  
Old 04-23-2019, 05:14 PM
Matt Matt is offline
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Have you guys had any success performing an injector flow return test? If so, do snap on scanners have the ability to initiate the "fuel pressure override test"?

Last edited by Matt; 04-24-2019 at 06:56 AM..
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