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+--- Thread: Code 4726 (/showthread.php?tid=6588)
RE: Code 4726 - Rawze - 09-10-2020
(09-10-2020 )Bama Boy Wrote: K stopped at another dealer, got fuel relief valve for $132. Replaced myself. Leak down test inconclusive because computer kept disconnecting when i turn off engine. I reset code and riding to see if it comes back.
<iframe id="lbry-iframe" width="560" height="315" src="https://lbry.tv/$/embed/isx-injector-leak-test-for-the-cm2250/e8187fb8d70f0f06388b597cb40751c5536d03dd" allowfullscreen></iframe>
RE: Code 4726 - Bama Boy - 09-10-2020
This is what I was doing, but kept losing connection with insight. I will try again when I stop for the night.
RE: Code 4726 - Mr Hagg - 09-10-2020
when its does connect how muc pressure does it have? a good system will keep pressure for a good 10 minutes... if in 1 minute it takes it to connect its down to less than 2000 psi then you still have a issue...
RE: Code 4726 - Bama Boy - 09-10-2020
I'll let you know, I think it had dropped to almost 100 just that quick
RE: Code 4726 - Bama Boy - 09-10-2020
Yes, it is leaking down faster than it will reconnect. I ran cylinder cut out test, it ran on every cylinder individually but seemed a little rougher on #4, I guess its time to learn cap nut test deal
RE: Code 4726 - Bama Boy - 09-10-2020
Do you know what size cap nuts are? I picked up some that are 1/2 inch brass but not sure they will work
RE: Code 4726 - Rawze - 09-10-2020
(09-10-2020 )Bama Boy Wrote: Do you know what size cap nuts are? I picked up some that are 1/2 inch brass but not sure they will work
brass caps will not work... the system has potential pressures as high as 40,000 PSI in it. You need the proper caps from cummins to keep from harming your engine or yourself.
RE: Code 4726 - Bama Boy - 09-11-2020
K the hunt for the caps begin
RE: Code 4726 - Bama Boy - 09-11-2020
Do yall have a part # for the cap off nuts? All I can find is for 6.7 cummins