2350 fuel pressure decay Fault code 4726
02-25-2021, (Subject: 2350 fuel pressure decay Fault code 4726 ) 
Post: #13
RE: 2350 fuel pressure decay Fault code 4726
4726 code came back today. Did a cylinder cut out test and when I cut out cylinder 5 the fuel knock is completely gone . All other cylinders sound the same. I think I will start the injector return flow test with cylinder 5 and see what happens. I bet the injector is done.


User's Signature: 2015 389 Peterbilt. ISX 550 18speed 3.70 gears
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RE: 2350 fuel pressure decay Fault code 4726 - SemiSweet - 02-25-2021



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