Excessive water in fuel M7060 clogged vent possibly?

[SingletonFarms]

I have a 2015 M7060 with about 1100 hours on it. Here lately I have been having to drain the water fuel separator very often. I thought it might be my diesel holding tank, but I filled a quart canning jar with it and no water separated. just to be sure I went ahead and completely drained my fuel tank. I was pretty amazed that I had almost 5 gallons of water in the tank. So I bought diesel from the filling station rather than fill from my holding tank just in case. Before even running a full tank from the filling station through, I have drained off another almost 2 gallons of water. So it is getting into the tank via condensation I think...it has been very humid here lately. I have what looks like two fuel vent hoses coming up by the filling neck to the tank. One connects into the top of the filling neck just below the fuel cap and the other connects to a U vent that is fastened into the frame.
I took the one off that connects to the fuel tank neck and it did appear to have some blockage, I blew through it and it was momentarily blocked then released. The air came out where I removed the line from.
The second vent line that is connected to the U metal tube seems to be just one way...I just blew into it as I did not want to use the air hose and cause damage. It took some air then blew it back to me...kinda like blowing up a balloon and letting the air back out.
Anyway, just trying to figure out this water problem and a mechanic friend suggested I check the fuel vent lines.

 

[ruger1980]

I seriously doubt your problem is condensation with that volume of water after less than a tank full of run time. Either there was till water in the tank, you are adding water during filling or there is a wicked amount of rain water getting into the tank.

 

[North Idaho Wolfman]

If your getting 2 gallons of water in the fuel, it's not a vent issue!
You sound like you have damage to a tank, or the fuel inlet.

Your going to need to drop the tanks.

 

[Tx Jim]

I agree with NIW that water must be entering fuel tank from the outside of tank. Is this tractor stored inside or outside? I suggest to install some fuel conditioner that contains a Biocide to control fungus growth in fuel tank. Several yrs ago my neighbors M8560 had water in fuel tank then Fungus grew in the water & his dealer replaced the common-rail IP & injectors for a cost of $7500 & that was before the Flu price inflation. I recommend closely inspecting fuel filler hose & fuel gauge mounting area

 

[Russell King]

There are water absorbing socks that can be installed into your tanks to hold the water out of the fuel. Since you are having so much water you should consider doing something to remove it. There are probably filters and separators for the holding tank. There are funnels that will keep the water out of the tractor tank. See Mr. Funnel for example but get a large flow version unless you are a very patient person.

 

[SingletonFarms]

I agree with NIW that water must be entering fuel tank from the outside of tank. Is this tractor stored inside or outside? I suggest to install some fuel conditioner that contains a Biocide to control fungus growth in fuel tank. Several yrs ago my neighbors M8560 had water in fuel tank then Fungus grew in the water & his dealer replaced the common-rail IP & injectors for a cost of $7500 & that was before the Flu price inflation. I recommend closely inspecting fuel filler hose & fuel gauge mounting area

Unfortunately it is stored outside. I will get some Biocide right away thanks for that. It very well could be some sort of damage to the fuel tank or filler tank.

As NIW stated I will likely be dropping the tank then.

I will post up what I find out.

 

[North Idaho Wolfman]

Another possibility:

Do you have any disgruntled employee's or enemies, like an ex wife, or fooling around on your current wife?

If you think anything is possible, I'd be putting a hidden camera on it, or pointing at it from somewhere close.

 

[SingletonFarms]

Another possibility:

Do you have any disgruntled employee's or enemies, like an ex wife, or fooling around on your current wife?

If you think anything is possible, I'd be putting a hidden camera on it, or pointing at it from somewhere close.

You never know...the thought did cross my mind

 

[SingletonFarms]

I dont suppose anyone has a detailed diagram of the Kubota M7060 fuel tank and hose system? Thinking that it would help me from time to time, I bought the work shop manual from Kubota for something like $250. great schematics around electrical, fold out diagrams and such, but not a thing on the fuel tank and fuel lines that I can find in this massive manual.

 

[North Idaho Wolfman]

This gives great lay out of parts:

Kubota Tractor Corporation - Illustrated Parts List

- K-PAD - Parts Lists - Illustrated Parts Lists - diagrams

apps.kubotausa.com

 

[SingletonFarms]

This gives great lay out of parts:

Kubota Tractor Corporation - Illustrated Parts List

- K-PAD - Parts Lists - Illustrated Parts Lists - diagrams

apps.kubotausa.com

OMG THANK YOU SO MUCH!!! I had no idea this was online. I found exactly the diagrams needed.

 

[North Idaho Wolfman]

OMG THANK YOU SO MUCH!!! I had no idea this was online. I found exactly the diagrams needed.

That will be $99.95 in small unmarked BitCoin!

 

[SingletonFarms]

Ok, I have the tank drained.

A bit of good news, I think anyway.

I had the fuel cap on tight and the water separator fuel feed line in the closed position. The fuel stopped draining and I knew it was not empty. So I took the fuel cap off and it started draining again. So, for sure the vent is clogged and that would explain the tractor losing power after about 30-45 minutes of use. I have that question in another post.

On the fuel tank, once I drop it, how best to clean it out as I am 99% sure I was getting biofilm built up due to the water accumulation in the tank.

The fuel vent line that connects to the neck of the fuel tank and goes to the top of the fuel tank is clear. I blew air threw it no problem. But that is a closed loop to the tank.

So in the diagram below, where does the tank actually vent? I did have to replace my cap not too long back. What is part number 020(packing) just under the fuel cap, I don’t think I have that. The fuel cap itself does not appear to be vented.

 

[McMXi]

So in the diagram below, where does the tank actually vent? I did have to replace my cap not too long back.

See my post here.

Kubota M7060 2018 model.

Our 7060 is losing power when cutting hay or brush hogging. I have been told to check the vent lines that come from the fuel tank, we have been unable to locate any line that looks like a possible vent. The tractor does fine as long it is not under a load.

www.orangetractortalks.com

 

[North Idaho Wolfman]

#20 is a cap seal and vent in one.

The vents are different if it's a Cab model or a ROPS model.

Which do you have?

 

[SingletonFarms]

Well if I can spell it correctly. ROPS model..no cab.

 

[North Idaho Wolfman]

Yes, On the ROPS model there is no vent besides the cap.

 

[SingletonFarms]

Yes, On the ROPS model there is no vent besides the cap.

ok, if the cap is not venting that I have, I probably need that part number 20?

 

[North Idaho Wolfman]

Yes if you don't have part #20 that will 100% cause your venting issues.
I might be your water intrusion issue too, it might just be causing a strong vacuum sucking water in.

 

[SingletonFarms]

I agree that the vacuum that was forming on the gas tank due to lack of venting was likely pulling the water in. Some of the fuel lines that are easy to get to between the filter and water separator were starting to rot. So I replaced those lines and used screw down hose clamps so they are tight.

I think the venting and water getting into the fuel was part of the problem.

But I am back to the original problem of the tractor loosing power basically after it gets warmed up. Meaning, I am running it no issues for about 30 minutes, then the tractor powers way back to somewhere around 1,000 RPM and there is nothing I can do to resolve that unless I let is rest and cool for a bit. Then it runs fine again for about 30 minutes then the power loss. It does not matter if the fuel cap is on or off.

Even in this impaired state, it will immediately start when I turn the key no problem.

What all I have done:
1) Completely drained the fuel tank and purchased fuel to refill it from the local gas station. There is no water in the fuel now.
2) I treated the fuel I put in there with bioside(sp), HEAT to dry out any water, and Diesel fuel additive to clean the fuel.
3) Replaced the short fuel lines that run between the pump, water separator, fuel filter and engine...all short fuel lines, but they were rotting a bit
4) Replaced the little check valve that runs between the separator and filter with name brand Kubota check valve.

It acts like something with the tractors computer is powering it down in some sort of protect mode. No check engine light or codes that I could tell.

I think at this point a computer needs to be put on the CAN system to see what the heck is going on.

I have no idea where the CAN service connection is otherwise I would hook up a computer or something just to dump the CAN info to a computer.

I do have a local mobile tractor repair person called.
Hopefully they have a Kubota computer they can hook up.