Kubota fuel lines

[Sam Mac]

I'm going to toss this out for whatever its worth. I had a 1782 that was hard starting, low power and it also would smoke when trying to start. Turned out to be a dirty secondary fuel filter. It was flowing fuel just not enough.

[sbauerz28]

Originally Posted by Sam Mac

I'm going to toss this out for whatever its worth. I had a 1782 that was hard starting, low power and it also would smoke when trying to start. Turned out to be a dirty secondary fuel filter. It was flowing fuel just not enough.

The filters are all new as of a few months ago. I will take out the filter and have a look at it tonight while I'm looking at everything.

My plan for tonight is to check flow thru electric pump, I will also check the fuel filters. Try to get it running, which usually takes while. Then I will do a compression check. Book says to run the engine first. So I guess if I can get it to start that's what I will do.

I was also reading the book on how to check the static injector timing. I want to check this as J-Mech mentioned, just not sure I will get to it tonight. I will try.

Guy I talked to at the diesel shop said with the injectors as they are and the smoking as I described the only reason it shouldn't atleast start would be lack of compression.

[J-Mech]

Originally Posted by sbauerz28

My plan for tonight is to check flow thru electric pump, I will also check the fuel filters. Try to get it running, which usually takes while. Then I will do a compression check. Book says to run the engine first. So I guess if I can get it to start that's what I will do.

Go ahead and get a cold reading. If you want a hot one too I guess that's up to you. You said you don't have an issue when it's warm, just cold. I wouldn't bother with a warm engine reading, but if you want to go ahead.

Originally Posted by sbauerz28

I was also reading the book on how to check the static injector timing. I want to check this as J-Mech mentioned, just not sure I will get to it tonight. I will try.

This process takes some time. Good luck. Seems like back when I worked at IH/Kubota (We had both dealerships.) There was a way to check timing with a dial indicator, but the IH book doesn't tell how. The way the IH book says to do it is kind of crude IMHO.

Originally Posted by sbauerz28

Guy I talked to at the diesel shop said with the injectors as they are and the smoking as I described the only reason it shouldn't atleast start would be lack of compression.

He's wrong. I can think of 5 other things off the top of my head that can cause it. I already mentioned most of them.


I still really want to see a pic of the fuel pump.

I wouldn't get to obsessed with the compression check. I can count the number of times on one hand that I actually needed to do a compression check on a diesel, and it wasn't for issues like you are having. It was to find out which cylinder was bad. Diesels fire on the heat of compression, so there are lots of ways that they indicate low compression. Most of the time you can figure out what's going on without ever hooking up a gauge.

[sbauerz28]

J-Mech. Here is the pics you wanted. Let me know if you want to see anything else. I'm going to fuel flow thru the filter and check the compression now.

[Tacosteelersman]

My fuel lever returns to open all the time unless I hold the throdle lever down to kill the engine, after it dies it returns to open. I think that is normal function, sorry this does not help with ur problem.

[sbauerz28]

Originally Posted by Tacosteelersman

My fuel lever returns to open all the time unless I hold the throdle lever down to kill the engine, after it dies it returns to open. I think that is normal function, sorry this does not help with ur problem.

Mine usually does too but I just felt it wasn't opening all the way so I installed the spring.

[sbauerz28]

I guess I'm with J-Mech now on the compression deal. Here's what I'm seeing. Looks a lot better than I thought it would and this is on a cold motor.
Cylinder 3- 470 psi
Cylinder 2- 460 psi
Cylinder 1- 470 psi

Filters are clean. No water in bowl. With the line off the injection pump from the filter I get good flow but no pressure. I can hold my finger over the line and nothing comes out. This may be normal. I'm not sure on that. Return line is also clear. I can blow in it easy and get bubbles in the tank.

[J-Mech]

Ok, I see a problem. It may not look like a big deal, but you need to adjust your kill cable.

In your pic, it looks like the kill lever is not touching the tower. When in the run position, the lever needs to be in contact with the tower, or the governor cannot go to the full fuel position. It needs full fuel for starting, and when it's under load. May not fix the problem, but it's not helping any.

kubota 2.jpg



And yes, Tacosteeler, that is how the cable system is supposed to work.

[J-Mech]

Originally Posted by sbauerz28

Filters are clean. No water in bowl. With the line off the injection pump from the filter I get good flow but no pressure. I can hold my finger over the line and nothing comes out. This may be normal. I'm not sure on that. Return line is also clear. I can blow in it easy and get bubbles in the tank.

Those electric pumps don't make a lot of pressure.... maybe 7 PSI. If in doubt, just replace it. It's one of the cheaper things you can do. If it doesn't fix it, it's a cheap item compared to the other items that could be causing the problem. FWIW, you should be able to dead head it with a gauge pretty easy and see how much pressure it makes.

You can get a pump from an auto parts store much cheaper than through CC or Kubota. Just make sure it's for diesel fuel. I know O'Reilly's can get/keeps them. Made by Mr. Gasket. The diesel fuel ones are green.

Compression numbers look good.

[sbauerz28]

Not sure what I did but I put it all back together and it fired right up with only about 15 seconds on the glow plugs. I will try to cold start it tomorrow because the garage was tee shirt weather for a few hours. I don't like working in the cold.

I had to compermise slightly on the fuel shut off cable. I had to adjusted so it touched the stop but it wouldn't pull it back enough to shut the engine off.