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dsalinas1939
Top Member
USA
1396 Posts |
 Posted - 02/04/2025 : 07:57:27 AM
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| have a c2 i put injectors in now i am getting a code for fuel pressure idling the command is 17000 and it only reads 2000 i have no leaks it seems to run fine so i wouldnt think ints a pump or it wouldnt run any thought> |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/05/2025 : 07:31:28 AM
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| 559 code more than likely, i bet if you pull the pressure limiting valve off of rail it will have dirt in it and keeping it open, do the fuel pressure test and check the temp. of the fuel rail return line it will be hotter meaning this valve is letting fuel to bypass(usually red paint will get in rail and cause this valve to stay open) , if not check the injector return it can be done the same way |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/07/2025 : 04:12:07 AM
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| ok will check thanks |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/10/2025 : 12:03:21 PM
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| i took the valce out saw no debris blew it out but a new valve in it fired it up it had 4500 psi at first then quickly startwd dropping to about 2800 psi i searched for the fuel pressure test but cant find it could the pressure sensor on back of fuel rail me reading incorrect? |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/11/2025 : 08:05:04 AM
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its the fuel pressure test or fuel leakage test it drives the pressure up to 20,000 psi or so, with engine off it should read close to zero the pressure sensor try the test and see if it goes up over 20,000 psi sounds like an injector is bleeding out the return
did you relearn the injectors with the laptop |
OEM trained in wiring and all engine platforms for over 20 years
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Edited by - Bluenozer on 02/11/2025 08:26:22 AM |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/11/2025 : 11:24:13 AM
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| i dont see a relearn for injectors but i tried to start the test it would not allow because pressure is low. when i first start engine it idles with 10000 psi fuel pressure and the command is about the same after 30 seconds of running the psi start to slowly drop untill its about 2000psi again i just put injectors in it had a bad one so did all six i put a new relief valve in y i was in there how can i check to see if an injector is bleead back??? |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/11/2025 : 11:30:54 AM
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| with key on engine off the the fuel rail pressure command is at 13712 the fuel rail pressure is 27 the pressure rationality senso says -385 that seems wierd to me is that correct |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/12/2025 : 08:11:58 AM
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ive never looked at commanded or rationality those only matter with engine running but the sensor is in spec -/+ 30 psi with engine off if it didn't have this problem before you did injectors then something is wrong that you had apart
run the fuel pressure test and either follow TS and measure how much comes out(normal its just drops, so pull banjo bolt see if i sprays) , or use a temp. and see if the return is hot if one is leaking then one by one remove head tube and block rail and do test when the fuel stops you found the injector that is bad |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/12/2025 : 12:59:48 PM
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| i am looking dor the block off tool for the rail to block injector cant find for isb 6.7 would u no where i can get |
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Bluenozer
Top Member
Canada
701 Posts |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/13/2025 : 04:07:45 AM
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| thanks gonna order it up |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/19/2025 : 10:25:41 AM
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| ok i got the fuel rail block off tool i blocked off inject 4 started up still the psi was well under what the desire is so i but that back together went to injector three blocked that one started it up and fuel was sprayin out of the feed tube where it didnt do that on the other injector why did it do this and where is fuel coming from???? |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/19/2025 : 12:56:25 PM
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| I tried to go to next injector now i have no hi pressure fuel pumped primer til it was hard no start but all back together to try and get it running now wont run no hi pressure fuel at did i lose the pump how can i check it right at the pump |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/20/2025 : 02:33:49 AM
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the rail input line started to spray fuel? , and you don't look at fuel pressure just watch the return from the line on the back of the head for this test
did you try putting it all back together and get it running?
the pump is just agear pump with a actuator , seen the actuator go bad never a pump on an ISB on an X15 yes not saying it can't happen
install gauge on rail feed line , i just always went by the sensor
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OEM trained in wiring and all engine platforms for over 20 years
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Edited by - Bluenozer on 02/20/2025 03:10:37 AM |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/20/2025 : 04:43:57 AM
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| i removed the fuelline for one of injectors put block tool on the rail started it and fuel came out of the feed tube which is connected to injector |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/20/2025 : 04:47:52 AM
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| and yes i put all back eogether and now it wont start |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/20/2025 : 05:07:17 AM
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| i would inspect that injector , if fuel was pushed from injector out its head tube the tip or o-ring(or copper washer is doubled up) is shot |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/20/2025 : 05:54:51 AM
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| so i am right fuel should not come out of that tube there brand new injectors |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/20/2025 : 07:44:52 AM
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you are correct
remove and inspect |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/20/2025 : 07:45:29 AM
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| i got good low pressure fuel pressure to the hi pressure pump but it trickles out of the hi pressure pump not sure if i should put a new pump are the actuatore first |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/24/2025 : 03:29:06 AM
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| you can monitor the amperage at the fuel actuator , the spec you would have to look that up (jpro or insite) but if it was bad it should log a code |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/25/2025 : 04:55:22 AM
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| i put a new pump in it but still cant get fuel pressure i got low pressure to the pump nothing coming out to rail |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/25/2025 : 10:46:25 AM
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holy jumpins i've replaced pumps but never had an issue like this, air getting in the low side causing this issue , but did it have this issue and this is why the injectors got replaced can build low pressure with air in fuel but high pressure it will not do
wish i could be there its hard to figure stuff out |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/25/2025 : 12:34:47 PM
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| it originally had 1 bad injector misfire but we always just do all of them if its over 100000 so replaced all started it up then i was getting code for low pressure in fuel rail so i was thinking it had a injector leaking so put a block off tool on fuel rail to see what injector it was the first injevtoe pressure still leaked down the second one still leaked down but on the second one fuel was comind out of feeder tube put all together then it would not start i had fuel pressure at th test port on filter but no pressure at the rail i cracked the line on fuel rail cranked and cranked and it just dribbled out so i ws thinking must be the pump because i primed the fuel for a long time cracked lines to try and get air out and nothing so i figured the pump took a crap but i replaced and still no started |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/26/2025 : 03:22:44 AM
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| if the code was 559 , when the unit would start and run the TS would have started at step 6 now that the unit is a no start im assuming the issue should be found within the first steps of the TS , bit of a pain to do and lots of tubes and gauges hopefuly your local cummins place will loan these tools or just buy the fuel kit from cummins it does many years |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/26/2025 : 06:40:23 AM
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| yeah its code 4691 but i just cant understand o have low pressure at test port on filter but nothing at rail it seams like a pump problem but the pump is new its driving me nuts |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/26/2025 : 07:44:33 AM
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| is there a priming procedure for the hi pressure pump? i actually got frustrated and sprayed some stating fluid i in take and it started right up ran went to hi idle for a while then check engine light came on then it shut down it has to be a injector leaking back |
Edited by - dsalinas1939 on 02/26/2025 08:37:08 AM |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 02/26/2025 : 10:42:30 AM
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| not that i know of , time it up(like an air compressor on older ones not 100% on the newer) and let it sail |
OEM trained in wiring and all engine platforms for over 20 years
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Bluenozer
Top Member
Canada
701 Posts |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 02/27/2025 : 12:42:39 PM
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| hmmmmm getting old lol dont remember that lol but i was told when u do the block off test no fuel should come from feeder tube and it does so i am thinking i have an injector pushing fuel back thru injector from return side so need to check the rest |
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 03/05/2025 : 12:11:41 PM
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| did block off test had fuel coming back out of injector on cylinder three warrentied that injector put new one in fired up no problems regen it now then road test and will see |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 03/06/2025 : 02:37:28 AM
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| excellent thanks for the update |
OEM trained in wiring and all engine platforms for over 20 years
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 04/15/2025 : 03:04:05 AM
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I just did a six pack , wouldnt start then it did ran and idled looked under bus and raw fuel dripping out of dpf/scr canister , shut it down it almost ran backwards , blocked intake to kill
nothing better then parts that are no god from new
didn't make oil which is good
now a day of blocking rail and finding bad injector or more |
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member
USA
1396 Posts |
Posted - 04/15/2025 : 04:01:15 AM
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| yeah that ***** i was told its probably the red or orange paint that cummins sprays there motors with thats always flaking off probably got in the rail then got stuck in the injector i had the rep come down that sold me the injectors to talk about what happened and thats what he was tellin me but i told him i i took that rail off and cleaned it out very well but he was sure it was some kind of debris that got in there he warrentied it still but just wanted to go over it |
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 04/15/2025 : 07:58:51 AM
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#5 exhaust shooting out of cross tube
jokes on him every 90 turn i used air gun to clear chips just like at the cummins depot like to see them try that one always our fault cant wait till America builds stuff lol |
OEM trained in wiring and all engine platforms for over 20 years
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Bluenozer
Top Member
Canada
701 Posts |
Posted - 04/16/2025 : 03:27:46 AM
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the injector that was bad , if you hold a rubber tipped blow gun at the tip, air comes out of where the cross tube seats, tested al six i took out and four do the same the other two no bubbles
not sure if this is a good test to try before installing new but i do know that i'll never do six at once
i'll do one at a time and start the engine between each one instead of trouble shooting new parts
i ordered the kits part#5579332 no core on injector? but if you buy just the injector part#5254261 there is a core , makes no difference in performance we have had issues with both
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OEM trained in wiring and all engine platforms for over 20 years
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Edited by - Bluenozer on 04/16/2025 05:59:23 AM |
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Topic |
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2017 c2 isb fuel pressure
