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Discussion Starter · #1 ·
Hey guys, we are getting fault codes concerning our fuel rail. The codes are 385: Fuel leakage detected during low idle. 386: Fuel leakage detected by quantity balance. 391: PRV recognised as open. We started getting the codes and they got more frequent throughout the day. We get a lot of black smoke and then a fault code appears and de-rates the engine. We cant even drive 100 yards and a code will appear. We have been sitting for 4.5 days now and still have the dealer stumped. We changed the fuel rail sensor, the PRV on the fuel rail, and the filters. Any suggestions would sure be appreciated.
 

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We had several of the codes like the fuel quantity balance and some others that would appear at idle that didn't appear if you didn't idle the combine. We changed lots of parts and didn't solve the issue. It would derate when trying to put power to it and we did have some black smoke.

The dealer checked with Gleaner and they said we had some bad injectors. They sent a whole set of injectors and they were replaced and that solved our issue. They said it was an emissions issue so there is a five year warranty on that on the Sisu engines so it is worth having the dealer checking in with Gleaner. It solved our problems and at least it ended up being one of the cheaper issues when they covered it. They took returns apart it seems like to discover two injectors were putting more fuel in the return than the others. I don't drive that combine so I didn't get too close to what the problem was but it did take a couple days to get going. Parts were overnight freighted in to the dealer though and the injectors were changed in the field.

That was our experience anyway with similar symtoms on our '09 R76.
 

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Discussion Starter · #4 ·
Thanks for the replies...the relief valve is brand new..one of the first things we replaced. Dealer came out and replaced injectors today, still didn't work. Getting really frustrated since we haven't cut an acre for 5 1/2 days and counting.
 

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It could be the injection pump. Had an s77 with the same type of issue and checked the rail pressure, which was low. Replaced the pump and solved the issue.
 

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You just might have plastic cuttings from the manufacture of the fuel tank plugging the screen inside the bottom of the fuel tank and there is probably another screen between the tank and the fuel filter. Don't ask how I know.
 

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Discussion Starter · #7 ·
Well today the dealer was finally able to hook the computer up to the machine and decided to change the high pressure pump or injection pump. This still did not fix the problem. We checked those filters for the plastic last winter when we had to drain the tank and put #1 fuel in it. The next thing to change is the fuel rail, its the only thing left. Which the dealer does not have, so at least 1 more day down and no combine. Thanks for the feedback guys, keep it coming.
 

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There are 2 metal screens, 1 in the tank and 1 close to the fuel filter. Both of ours clogged last year everytime the fuel tank got low. Drained the fuel this winter and flushed the tank. Just yesterday, omce again, the screen next to the fuel filter clogged full of plastic cuttings from the manufacture drilling the holes in the tank. We must not have gotten the tank flushed well enough.
 

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We are getting the 386 code, rail pressure leakage detected by quantity balance, currently 2 days with no crop cut, have cleaned the screens, new filters only went on 70hrs ago, new pressure sensor and relief valve, had mechanic put computer on this morning, they are leaning towards the pressure pump, only problem is nil stock in australia, dont know how long will take to get one out of the states..with a $5500 price tag..

why is it so hard for them clowns higher up the chain to stock parts? What scares me now is that agco are running these same sisu motors in everything,including the challengers and rogators..

our 2010 R76 has less than 1000eng hrs and it has already had a water pump fail and a motor blow up at 500 hrs, alternator locked up at 880hrs and caused a paddock fire, and now fuel pump at 950hrs, had 3 sets of rear feeder chains fail in less than 700 rotor hrs, and has had a new set of chopper blades, and I think nearly every belt has been changed..why is it so hard to get any life out of anything anymore?

Sorry about the rant, we are just quickly losing faith in these machines
 

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Discussion Starter · #10 ·
Our problem ended up being the fuel rail. It was washing out by the relief valve. We are starting to get the same codes starting to show up again, so I think we are washing the new one out already. I would be willing to bet it is your fuel rail which is relatively cheap compared to the other options. I just ordered another one just in case and it was on backorder....makes me wonder if there are a lot with the same problem. Well good luck, hope you get it figured out.
 
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