D1105 what are these fittings?

[ChrisRI]

Hi All, I have a D1105 and hooking it up but dont know what these fittings. The one on the last injector I've seen called a "return". Does that have to go back to the tank? Does it flow a lot? The other one on the fuel injection pump with a cap, I have no idea. Any info appreciated.

 

[MOOTS]

Here is one of my 1105’s at work. Black hose returns to tank. Other ties pump to rail.

 

[ChrisRI]

hey I finally got this kubota installed and not sure what mean "other ties pump to rail". that rubber capped off one on the pump spurts diesel when I turn on my electric lift pump that feeds the injector pump unit. just wondering what its for and where they get hooked up.

thank you

 

[Russell King]

Here is what I think @Matt Ellerbee meant…
The connection point on the injector pump is connected to a barb on the rail in the picture. That connector is in his picture but at the front end injector. You can see his hose crossing under the black plastic wire loom. Then the rear injector barb in your picture is routed from the rear injector to the tank (probably near the top).

That way the electric pump will force air out of the hoses. The injector pump will also push more fuel to the injector than the injector needs and that excess also flows through the hoses back to the tank.

I don’t see the barb on your front injector. I think you could just route that injector pump port to the tank directly and not create any problems.

 

[MOOTS]

Here is what I think @Matt Ellerbee meant…
The connection point on the injector pump is connected to a barb on the rail in the picture. That connector is in his picture but at the front end injector. You can see his hose crossing under the black plastic wire loom. Then the rear injector barb in your picture is routed from the rear injector to the tank (probably near the top).

That way the electric pump will force air out of the hoses. The injector pump will also push more fuel to the injector than the injector needs and that excess also flows through the hoses back to the tank.

I don’t see the barb on your front injector. I think you could just route that injector pump port to the tank directly and not create any problems.

Exactly. Thank you for articulating that better than I did. Lol. Must have been in a hurry and typed that out, as I really don’t remember doing it!

 

[ChrisRI]

so connect the barb on the front side of the injector pump to the barb on the back of the injectors to a tee, and back to the tank?

dumb question, what happens if they just stay capped off? (not going to just asking what would happen)

 

[MOOTS]

so connect the barb on the front side of the injector pump to the barb on the back of the injectors to a tee, and back to the tank?

dumb question, what happens if they just stay capped off? (not going to just asking what would happen)

Do you not have a barb on the front of injector rail? I can’t tell from the angle you took the picture.

 

[ChrisRI]

Do you not have a barb on the front of injector rail? I can’t tell from the angle you took the picture.

Nope just the one at the rear. Not sure what its called but I read they occasionally flow "extra fuel" from the injectors back to the tank.

It just occurred to me, why not connect that fuel injector overflow rail barb to the barb on the front of the pump which sees lift pump pressure? It would be the same as going back to the tank, right? Or even just tee it into the fuel line just before tyhe engine?

It would be nice to avoid having to run a return line into the tank.

 

[Daferris]

It just occurred to me, why not connect that fuel injector overflow rail barb to the barb on the front of the pump which sees lift pump pressure? It would be the same as going back to the tank, right? Or even just tee it into the fuel line just before the engine?

Because going to the tank it's "0" pressure if you tie it to the pump ( on the supply side from the lift pump) it would have to overcome the lift pump pressure. My guess is that would force extra fuel into the cylinders as the return would have some "back pressure"

 

[Russell King]

Exactly. Thank you for articulating that better than I did. Lol. Must have been in a hurry and typed that out, as I really don’t remember doing it!

Don’t worry too much about remembering the post…it was a year ago when your post was done and the thread has now risen from the ashes.

 

[ChrisRI]

It just occurred to me, why not connect that fuel injector overflow rail barb to the barb on the front of the pump which sees lift pump pressure? It would be the same as going back to the tank, right? Or even just tee it into the fuel line just before the engine?

Because going to the tank it's "0" pressure if you tie it to the pump ( on the supply side from the lift pump) it would have to overcome the lift pump pressure. My guess is that would force extra fuel into the cylinders as the return would have some "back pressure"

I was thinking a tee just before the lift pump. same pressure as the tank. not sure why that wouldnt work... but, then again, what do I know... not much!

 

[Russell King]

so connect the barb on the front side of the injector pump to the barb on the back of the injectors to a tee, and back to the tank?

dumb question, what happens if they just stay capped off? (not going to just asking what would happen)

I would put a line off the rear injector barb back to the tank that should have a barb to attach the line to. Then you can put a tee in that line and go from the pump fitting to the tee.

Do not go from the pump to the barb directly. The farther away from the injector wit the tee the better it is due to less chance of putting pressure into the barb at the injector.

You can probably get a fitting for the front injector that is identical to the rear injector fitting and then run it like @Matt Ellerbee shows his. Find out what tractor the engine fits and look on the Kubota website for the front injectors and see if you can get the part.

capping those sounds like a bad idea, The excess fuel will need to go somewhere

 

[Russell King]

I was thinking a tee just before the lift pump. same pressure as the tank. not sure why that wouldnt work... but, then again, what do I know... not much!

There will be some static head pressure there but it would probably work like you say. But why not tee into the return line that you have to have anyway?

 

[ChrisRI]

There will be some static head pressure there but it would probably work like you say. But why not tee into the return line that you have to have anyway?

this kubota D1105 came outta a reefer unit and is now in a boat. I am using an outboard fuel tank and dont want to run 2 lines to it. I *think* I can run these right into the line before the lift pump which is right near the engine.