fuel leak.

[gravelman]

Hi all, gravelman here.. my Kubota 2650, 2016 year is leaking fuel somewhere under the tank. ONLY when running. Cannot find the source despite close inspection. Took to repair shop. It is a significant leak also. Anyone out there with some possibilities?? Don't know when they can get to it so i thought id start researching possible cause. Did not see any hoses or lines loose or disconnected. Hoping it is a simple fix but that is usually not my luck Thanks

 

[claggstractors]

Could be the return line going into the top of the tank leaking, then running down the side of it, making it appear that the leak is on bottom of the tank. That would explain it leaking only while running at least.

 

[gravelman]

ok im not familiar with "return line" what role does that play?? keep in mind, im no mechanic but WILLING TO LISTEN

 

[claggstractors]

It is a line that returns unused fuel from the injection system back to the fuel tank. Would have to pull up the parts manual at least to see exactly how your's is set up.

 

[gravelman]

Ok i will look into that THANK YOU VERY MUCH

 

[claggstractors]

No problem man, been workin' on tractors my whole life. Glad I could help.

 

[Zebrafive]

I had to replace all the hoses (fuel lines) on my JD 6415. They started to leak at the fittings where the clamps were. Not enough line to cut them shorter. I used Gates Baricade hose. It comes in both high, and low-pressure versions. High is for fuel injected cars/trucks. I used low.

 

[claggstractors]

Just looked it up since I was curious. I'm assuming its a B2650 since you said 2016 model. Yours has two lines goin' into the top of the tank. One from the top of the fuel filter, and the other goes from the rear most injector. May get lucky and able to trim off the broken part of line and reattach to get back goin' right away.

 

[arto98607]

Is it similar to L2650 fuel filter / tank setup in the photo below?

If so, it should have two fuel return lines and should be easy to spot the leak.


Kubota L2650F (2wd) Parts

 

[gravelman]

all very helpful and much appreciated. yes, it is a B2650 thank you

 

[gravelman]

No new news yet but i would think if it was a return line there would be just a small amount of leakage??? This leak i have is quite large, almost running out as soon as i start engine. Will know more next week

 

[arto98607]

Small flow yes, but it's all relative.

The return flow in my Kubota F3060 is pretty substantial but never had reason to measure it.
I can see it when engine is running and fuel cap is opened up.

Wild guesstimate is under .5 gallons per minute, but certainly enough flow to make a mess in just few seconds.

 

[claggstractors]

Yep, little Kubota B7100 returns about half a gallon a minute while the JD 5020 returns what seems like 5 gpm. All it takes is a quart though to seem like a buckets worth spilled out.

 

[gravelman]

ok now i am getting a better picture...i could not imagine that much so fast. Also, everything is so packed under the tank it is difficult to see much less get at things..arrrrrrrrrrrrrrrhhhhhhhh