MX5200 fuel issue?

[Pomoxis]

Ok guys, first post.

I did do some research into this and didn't readily find anything that addressed this directly, so I am asking you guys.

MX5200 HST purchased new in 2015. Has about 90 hours now. Runs like a top until is stops. No bogging or losing RPMS, just stops. Might have ran for an hour, or might have ran for 10 minutes before it happens. Will not immediately start back, but appears to start back fine later on (when cool).

I have changed separator screen and filter. Screen looked pretty good but changed it just to be sure. I cut open the spin-on filter to inspect the element. Element was nice and clean so nothing evident there (such as algae).

Lift pump is running when key is on. I do not recall if I could still hear it when the engine died, will make note of that next time it happens.

Any suggestions will be appreciated.

 

[Mister]

Wonder if it is that stupid seat sensor? It either incorrectly thinks you aren't seated, and cuts the engine, or you're leaning or tilting on the seat and it cuts the engine

Sent from my SM-N950U using Tapatalk

 

[Pomoxis]

Wonder if it is that stupid seat sensor? It either incorrectly thinks you aren't seated, and cuts the engine, or you're leaning or tilting on the seat and it cuts the engine

Thought about that (or another) safety switch, being that it dies quick in the same manner. I will check all the associated wire connections I can locate.

 

[Pomoxis]

Tried again today. Ran a little over an hour, then died. I could still hear the lift pump running. I fiddled with all the electrical connections I could find and manipulated the safety switch on the seat with no luck. After a few minutes, I did get it to start weakly only to die after a couple of seconds.

Would still love to hear suggestions. Am hoping for an in-the-field solution before an expensive trip to the shop.

 

[D2Cat]

Can you take the fuel line loose as it comes out of the fuel tank to be sure you have good flow there? Maybe something in the tank, like grass or rag that moves around to cause an irregular fueling problem.

If not problem there, follow the fuel lines checking at each connection to the IP.

 

[majorwager]

WOW, not sure how grass or a rag could have ended up in the tank? (Previous hypothetical) Sounds rather careless. At any rate, I have a MX 5100 and there is NO fuel filter canister on my tractor? I only have a paper filter submerged in a permanent filter bowl.


Anyway, I suspect the safety switch, particularly at the seat. Is the tractor stored out of the weather?

There is not much travel in the stock seat suspension so it is likely that leaning would not allow sufficient travel to activate the switch. At any rate my seat switch met w/ a modification upon purchase. If I wish to exit my tractor at any point, that is MY prerogative.

 

[ZD326S]

Long shot but I had fuel issues on my MX6800 and turned out to be grass in fuel line at the back elbow going into water separator. This is the first stop for the fuel on my MX6800. There is a small screen you maybe the one you mentioned...but my blockage was behind that small screen in the elbow. The level on the separator would be fluctuating when running......that's the way mine was acting anyways. Didn't know if you removed the back elbow or not. If the level is not fluctuating then this is probably not the remedy.

 

[D2Cat]

A few years back I bought a Case 930 that had been setting for two years. The guy told me he was using it in the hay field and it quit running and couldn't get it started. They dragged it to where it was when I saw it. They thought it was the injection pump.

I bought it "as is where is" for $1200. Took a couple of evenings in the 95 deg days to get it figured out, but it had a wad of hay in the tank and it plugged up the line at the very bottom. I pulled the fitting at the bottom and nothing came out. I stuck a a bent piece of baling wire in and out came a "fish".

Roaded that tractor 15 miles to the farm and used it for years. Never did anything else to it.

How grass gets in the fuel tank, I don't know, but it does!!

 

[RCW]

Pomoxis - does it just die quickly like turning key off, or does it stumble first??

A quick shut down says safety switch, electrical, or maybe fuel solenoid (if it has one, and not sure how your model works).

Stumbling says fuel/fuel delivery. That’s me anyway, and I’m probably oversimplified...

Hard to diagnose from a distance, so just throwing out suggestions.


Sent from my iPhone using Tapatalk

 

[RCW]

I just read the thread again.

The suggestion about the clog at the water separator or fuel filter has shown up a couple times. Good place to look!!


Sent from my iPhone using Tapatalk

 

[thepumpguysc]

Wix P# 33971
Pull the line off the tank, install the see thru filter & let it drain into a bucket.

 

[Pomoxis]

Pomoxis - does it just die quickly like turning key off, or does it stumble first??

A quick shut down says safety switch, electrical, or maybe fuel solenoid (if it has one, and not sure how your model works).

Stumbling says fuel/fuel delivery. That’s me anyway, and I’m probably oversimplified...

Hard to diagnose from a distance, so just throwing out suggestions.

It is a quick shut down, like if you turned the key off. I too suspect an electrical, but have pretty much checked everything I know to check in that regard.

Thanks for all the responses. I have looked as best I could for physical obstructions and don't readily find any. Due to my limited time, I am going to break down (pardon the pun) and take it to my dealer today. If I remember I will post the outcome for future reference.

 

[Pomoxis]

Long shot but I had fuel issues on my MX6800 and turned out to be grass in fuel line at the back elbow going into water separator. This is the first stop for the fuel on my MX6800. There is a small screen you maybe the one you mentioned...but my blockage was behind that small screen in the elbow. The level on the separator would be fluctuating when running......that's the way mine was acting anyways. Didn't know if you removed the back elbow or not. If the level is not fluctuating then this is probably not the remedy.

Level not fluctuating best I can tell.

 

[lugbolt]

I was going to say....the only "good" way to diagnose one of those is with Diagmaster. It's all computer controlled (the fuel system) and there's no way we as consumers can do a proper diag on them without a laptop (or a mobile PC) and Kubota's proprietary software.

They may find a code stored in the ECU. That would make it easy if they find it. If not, then they're on a wild goose chase. Been there, done that

Saw reference to an inline fuel filter. Not needed, IMO. Kubota's filters are top notch. They have to be so that the rail pump is fed nice clean fuel. If it gets any dirt at all in it, it can quickly become expensive scrap iron-and because of that, it's adviseable to change the filter often and use the Kubota filter. I've seen them with Wix filters on 'em and the deal is, Wix can't confirm that their filter will filter down to the same micron level as Kubota's filter does; and because of THAT, if you have a common rail pump dead and/or injectors due to dirt, Kubota can deny warranty repair if it's got a non-kubota filter on it. I hate it but I also understand why.

 

[thepumpguysc]

I understand what your saying Lug.. but I respectfully disagree..
Kubota doesn't MAKE their own filters.. Just like Cat & JD don't make their own filters.
Personally, I would like to SEE if I have a problem w/ my fuel..
I'm not talking about REPLACING the original filter assembly.. just adding to it.. right out of the tank or real close by it..
RATHER THAN> calling the dealer, getting a 600.00 pu/del. fee, waiting 3 months for some yahoo to drain my fuel tank..& getting another 800.00 service bill..
I would RATHER> raise the hood, SEE the "gunk" & go DAM.. I gotta drain the tank..
Maybe its just me??

 

[thepumpguysc]

Granted, there are many inferior filters flooding the market place.. just have a look around utube for demonstrations.. it'll surprise the heck out of ya.
Theres a fella that cuts open & "shows you" the innards.. on a few popular brands.
EVERY manuf. denies warranty for not using their products & maint. schedules. It only makes "cents".. lol
Weather its a mechanical injection pump or an electronically controlled common rail system.. they ALL SHARE 1 thing.. dirty fuel.. so "IF" you can control THAT.. you'll have many carefree hours on your machine.. Happy tractoring.. TPG

 

[troverman]

The MX5200 is a common-rail engine. It is much *less* tolerant of fuel contamination than the older mechanical injection systems were. The big reason is injection pressure is much higher on a common rail. You'll note that the MX5200 has an electric lift pump (even though the tank is still above the engine), a dedicated water separator, and a full canister fuel filter. Mechanical injection engines had gravity feed to the main fuel pump and a simple submersed paper element in a clear bowl. With the higher fuel pressure, diesel is needed to lube the injection pump. Water in the fuel will strip the cylinders of lubrication and form rust. It isn't long before metal shavings are making their way to the injectors and destroying them, in addition to the pump.

I have an MX4800 which is the same as an MX5200 sans the turbo. I've noted you can easily cut the engine based upon leaning out of the seat a little while running. I'm going to override that switch soon.

 

[lugbolt]

I understand what your saying Lug.. but I respectfully disagree..
Kubota doesn't MAKE their own filters.. Just like Cat & JD don't make their own filters.
Personally, I would like to SEE if I have a problem w/ my fuel..
I'm not talking about REPLACING the original filter assembly.. just adding to it.. right out of the tank or real close by it..
RATHER THAN> calling the dealer, getting a 600.00 pu/del. fee, waiting 3 months for some yahoo to drain my fuel tank..& getting another 800.00 service bill..
I would RATHER> raise the hood, SEE the "gunk" & go DAM.. I gotta drain the tank..
Maybe its just me??

Probably right. But just because someone else makes it for them doesn't mean that another brand from the same company is the same filter. It just comes out of the same company, that's all. Kubota specifies a micron filtration standard for their equipment and the last I heard (about 5 months ago)-not a single aftermarket filter on the market that was tested (and was tested by a 3rd party) came anywhere close to the ones that are branded and marketed by Kubota-hence the parts and service bulletin they issued about it. Spent a couple hours on this at DFW....they drilled it into our pea brains....I don't remember the actual spec with certainty but I do remember that the micron rating difference was pretty substantial. Maybe they've gotten better now. Dunno. I don't go out of my way to test filters. I don't have time after fixing dirty fuel system screwups among other things.

 

[Pomoxis]

UPDATE

Ended up being a fuel solenoid (or whatever it's officially called), possibly related to a previous incident (rats chewed up wiring) requiring a new wiring harness being installed.

 

[Mudball]

UPDATE

Ended up being a fuel solenoid (or whatever it's officially called), possibly related to a previous incident (rats chewed up wiring) requiring a new wiring harness being installed.

So glad you found the problem. I hate that you have to get a new harness because of rats. I know that Id be investing in a substantial amount of rat poison very soon. I spread it around in my shed periodically due to this specific problem.