Kubota M5950DT No Start

[baydog1]

Hello. I just bought a M5950DT that will not start. It cranks over but will not start. I don't have any fuel coming out of the injector lines at the injectors but have plenty of fuel at the injection pump when I remove the little drain plug at the top of the injection pump. The tractor has been sitting about 4 years. I installed a new supply pump. Is there any tricks to bleeding the fuel systems on these tractors or a certain procedure to bleeding the fuel system?
Thanks
Scotty

 

[007kubotaguy]

I believe your tractor has a cav injection pump. You should have two bleed screws on the side of it that take an 8 mm wrench. If you have good fuel out the lower bleeder and it won't pump chances are you have a bad injection pump. These pumps don't like to sit.

 

[baydog1]

I believe your tractor has a cav injection pump. You should have two bleed screws on the side of it that take an 8 mm wrench. If you have good fuel out the lower bleeder and it won't pump chances are you have a bad injection pump. These pumps don't like to sit.

Thanks. It's a Delphi pump. It has a 1 wire fitting at the bottom of the pump with nothing hooked to it. Is that fitting supposed to have 12 volt to it when key is turned on?

 

[007kubotaguy]

Thanks. It's a Delphi pump. It has a 1 wire fitting at the bottom of the pump with nothing hooked to it. Is that fitting supposed to have 12 volt to it when key is turned on?

Post a picture

 

[GeoHorn]

A tractor that age might have a fuel shut-down valve operated by a manual pull-knob and cable system…. Have you checked that connection and confirmed the valve is in the open position? (Newer tractors have electrical shut-down solenoids…..and the question would then be….Is the shut-down solenoid operating correctly?)

 

[baydog1]

A tractor that age might have a fuel shut-down valve operated by a manual pull-knob and cable system…. Have you checked that connection and confirmed the valve is in the open position? (Newer tractors have electrical shut-down solenoids…..and the question would then be….Is the shut-down solenoid operating correctly?)

Thanks. Is the shut down solenoid located on the bottom of the injection pump body? There is a plug on the bottom of the pump with 1 male electrical spade terminal sticking off of it but no wire is hooked to it. It does have a mechanical shut off lever also. Is switched 12 volts supposed to be at this solenoid?

 

[baydog1]

On the bottom of the injection pump is a pipe plug with a male electrical terminal that doesn't have a wire hooked to it. Is this a type of shut off valve?

 

[Russell King]

There is a stop switch (#60) involved on your tractor. I don’t know if that is attached to the injection pump but it usually is near the pump. I didn’t see anything on the pump itself but you can look at that yourself at Messicks or Kubota illustrated parts lists

 

[baydog1]

 

[baydog1]

Hello. I posted a picture of the injection pump on this tractor. Getting plenty of fuel from supply pump to the injection pump. Just can't get much out of the fuel lines at the injectors. I'm guessing on the compression but the rain cap jumps up and down when cranking and when i put my hand over the air intake i can feel it sucking my hand. I know that's kinda a knuckle head way of testing for compression but hoping it's enough suction to pull the fuel needed maybe???

 

[baydog1]

 

[baydog1]

Not sure but the fuel looks like rusty water and the filter is just plain nasty. The tank looks like it could be a bear to take out. Is there a way to just drain the fuel tank without removing it? has any ever pulled a fuel tank out of a M5950DT?

 

[baydog1]

Post a picture

 

[Russell King]

It would help if you marked, in some way, what you are asking about on the injection pump.

To drain the tank, there may be a drain plug but you can turn the fuel outlet off and remove the hose from the tank outlet or before the fuel filter and drain it into a bucket. Perhaps through a coffee or paint filter to catch anything that might be in there.

The pistons movement and compression have no bearing whatsoever on how fuel is INJECTED into the cylinders. That is done by high pressure from the injection pump through the injectors.

You could loosen or remove the nuts at the injectors and see how much fuel the injection pump is moving.

 

[007kubotaguy]

The o-ring in the top of your fuel filter is your problem. That o-ring goes up in the housing in the grove. You should also have a small o-ring the goes in the center of the housing that the filter slides up on. The way you have in now little to no fuel will pass through the filter. Replace the filter and o rings and open the bleed screws on the side of the injection pump and pump the lift pump. Once you have good fuel flow out of the bleed screws close them. Now loosen one injector line at the injector. It should start relatively easy. Close the line once started.

 

[North Idaho Wolfman]

I don't think there is an electrical fuel shutoff on that model of pump.
There is a manual fuel shut off.
It's the red circled lever.
I would not try and start it or run it off of the onboard fuel system.
Use a remote fuel tank and feed the injection pump, just gravity feed it.
You will need to bleed the fuel injection lines.
But all of this is a crap shoot as @007kubotaguy said these pumps don't like to sit.
DO NOT remove the pump before reaching out as there is a timing mark that needs to be copied before removing the pump to have it serviced.

 

[007kubotaguy]

You also have a Cleanable screen under the dome of the lift pump I would check and clean. You must also have a electric fuel shut off.