Code 4726
09-10-2020, (Subject: Code 4726 ) 
Post: #1
Code 4726
looking for help on how to test fuel pressure relief valve and injectors on CM2350.
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09-10-2020, (Subject: Code 4726 ) 
Post: #2
RE: Code 4726
I have insight and did fuel leak down test, and pressure falls very rapidly
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09-10-2020, (Subject: Code 4726 ) 
Post: #3
RE: Code 4726
if the pressure relief valve is more than a couple years old, you could replace it and see if it passes the leak test again.


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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09-10-2020, (Subject: Code 4726 ) 
Post: #4
RE: Code 4726
Ok so we remove banjo bolt and take a place a bolt the same size as the banjo bolt and use washers and the ones that come off the banjo bolt tighten it up and then start truck see if you see ANY fuel dripping out its bad... Then with insight run up fuel pressure through the fuel pressure leak down test... Onces it reaches 29000 turn truck off and see if its leaking. If not then you will need to start capping off injectors one at a time. A few times I have found the injector connecting tube is the problem may have worked loosed or what ever. So before I throw a $1000 injector at it, I will inspect connector tube and clean and reinstall and torque to spec.... And try again... If that dont work then replace injector + a new connector tube. NOTE: the caps can be bought from any cummins dealer.. I have all 6 so you can cap off as many as needed....
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 Thanks given by: Rawze , redbeard , Signature620
09-10-2020, (Subject: Code 4726 ) 
Post: #5
RE: Code 4726
Thx! I will update results
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09-10-2020, (Subject: Code 4726 ) 
Post: #6
RE: Code 4726
Well 1st dealer I stopped at had neither pressure valve or cap off nuts on down the road we go
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09-10-2020, (Subject: Code 4726 ) 
Post: #7
RE: Code 4726
Shoptalk
Possible causes of this fault code include:

Leaking fuel injectors and or fuel injector connectors

Leaking fuel rail pressure relief valve


So your on the right track
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 Thanks given by: redbeard
09-10-2020, (Subject: Code 4726 ) 
Post: #8
RE: Code 4726
(09-10-2020 )Bama Boy Wrote:  Well 1st dealer I stopped at had neither pressure valve or cap off nuts on down the road we go

that is pretty sad ... you would think the OEM repair facilities would at least have the right stuff for such a fairly common issue.


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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09-10-2020, (Subject: Code 4726 ) 
Post: #9
RE: Code 4726
K stopped at another dealer, got fuel relief valve for $132. Replaced myself. Leak down test inconclusive because computer kept disconnecting when i turn off engine. I reset code and riding to see if it comes back.
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