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JD 4720 sprayer fuel rail pressure
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TTidwell07
Posted 4/9/2013 20:22 (#3023501)
Subject: JD 4720 sprayer fuel rail pressure


My 4720 has been throwing fuel rail pressure codes for 2 days now. Code 1347.7. Runs fine in the field other than the code coming up. When going down the road is when it loses power. The code doesn't come up and stay. It'll come up and stay for a minute or two then go away, then come back a few minutes later. Any suggestions on where to start looking?
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stricker78
Posted 4/9/2013 20:40 (#3023551 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


Alliance, NE
Change fuel filtersnor it might be bad sensor?
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TTidwell07
Posted 4/9/2013 20:43 (#3023561 - in reply to #3023551)
Subject: Re: JD 4720 sprayer fuel rail pressure


Forgot to mention I changed the filters and they have about 20 hours on them since change. Also drained the water separator on both filters today, no luck out of that.
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srb
Posted 4/9/2013 20:47 (#3023580 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


Mine throws that code a lot also and was told they are picky on filters. I change regularly but still get code but I never have any power loss. Might be something else ?

Edited by srb 4/9/2013 20:47
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TTidwell07
Posted 4/9/2013 20:52 (#3023607 - in reply to #3023580)
Subject: Re: JD 4720 sprayer fuel rail pressure


I was told by the dealer today that it could be anything from trash in the system to cracked housing where the filters are. Also to change the filters again and see if that does anything. I guess that's the first place to start. There isn't any visible fuel leaks anywhere on the motor. The motor does change sounds some and will starting knocking hard for a few seconds like its starving for fuel.
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steinry59
Posted 4/9/2013 21:35 (#3023772 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


SE MN
There was a thread on here the other day about 30 series tractors and rail pressure codes. 1347.07 mostly tractors but one on 4830 maybe same issue? Not sure if 4720 has same motor but there was some suggestions beside filters I'm not sure how to post the thread here
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Kamp
Posted 4/9/2013 23:06 (#3024055 - in reply to #3023501)
Subject: RE: JD 4720 sprayer fuel rail pressure



Central SD
IIRC I had that problem on my 4720. I know I have a short fuel line for it around here somewhere. Check to make sure all the fittings along the rail are tight or tiny pin hole in lines. Seems like whenever I had the problem, I could smell fuel, but couldn't see any evidence. I think it was a loose connection, highly pressurized, just a mist of a leak. Sorry my memory isn't any better, been a few years since.
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deere4760
Posted 4/10/2013 05:44 (#3024221 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


Renville County, MN
Could be your fuel rail pressure relief valve. Have seen a few of them do what you are talking about. The are a one piece unit and have take a few out the come out in pieces.
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TTidwell07
Posted 4/17/2013 17:53 (#3042667 - in reply to #3024221)
Subject: Re: JD 4720 sprayer fuel rail pressure


Still giving trouble and seems to be getting worse. Been spraying wheat for the past two days and it ran fine yesterday, still threw the code but the motor never checked up. Today was a different story. Ran fine till about lunch then started losing power. It would die down in first gear and start putting out black smoke. Could only run the hydrostat about half in first gear. Drained the separators on both filters and it would do fine for about 5 minutes then start right back. Starting to wonder if its trash or water in the fuel? It's about a quarter of a tank full right now. Going to try and change filters in the morning and run some diesel treatment through it to see if it helps. Any other suggestions on what it might be?
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steinry59
Posted 4/17/2013 18:09 (#3042708 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


SE MN
Suction control valve or pressure relief valvd
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TTidwell07
Posted 4/17/2013 18:55 (#3042824 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


I have about 300 more acres to go. Gotta try and get over it before I do anything. Should I fun just enough fuel in it to get over that then drain the fuel and check the screen filter inside the tank? Trying to check everything from the tank to the motor. Starting with the simple stuff
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TTidwell07
Posted 4/17/2013 20:01 (#3043055 - in reply to #3023501)
Subject: Re: JD 4720 sprayer fuel rail pressure


Also, after draining the filters, when I go to prime them back up on the transfer pump, it never gets tight. The motor will eventually start but the little primer handle will never get tight, like the filters are full. Is this normal?
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