Kubota BX24 Injector pump problem

[Max Power]

Max,

if I have fuel going to the injector while cranking, what king of electric problem would prevent the engine from firing?

Thanks

air ...you may still have air in the injection system preventing a start.

it is possible that it is a separate problem (from your original problem) and when you start to remove lines air can get in. when you bleed the system there may still be air in the injectors or other places depending what you had off even though the lines are spitting fuel. when you reconnect the lines the air compresses and expands but doesn't necessarily get pushed out. You may need to bleed more or crank more. the best method for bleeding is to crack the lines while cranking and close them when there steady fuel coming out.

 

[Willl]

Ditto what Max said.

Where in this corner of PNW are you ?

 

[fred98050]

Ditto what Max said.

Where in this corner of PNW are you ?

East of Seattle

 

[Willl]

East of Seattle

I'm south of Tacoma, probably a little to far for a quickie stop over.

Wish I was closer, sounds like an easy fix/fault find.

 

[fred98050]

Thanks,

Would have been nice to get some help but I think that I am going to take the injector pump to be tested..

Tried everything, checked everything.

 

[oldnslo]

Fred,
Not real familiar with the injectors on these little diesels but can you remove one of them from the engine? Reroute the supply line so that you can have the injector spray into a mason jar. What dad and I used to do when when had diesel injector questions. This shows you how well the injector is spraying the fuel in a contained environment. No spray then remove the injector from the line and just point the line into the jar. Now do you get fuel flow. If yes try connecting the injector again. Air locks do strange things.

Another check. Can you put a gauge in the fuel inlet line from the electric lift pump. Not sure what pressure these run at but would 5 - 10 PSI since the hose is low pressure hose. Do you see pressure in this line while cranking the engine. No fuel in = no fuel out.

Not to say it doesn't happen but injector pumps don't usually just quit, start and quit again.

good luck

 

[dodge man]

Its possible you have problems with your injector pump, but I've just never heard of this being a problem on BX's. Are you sure the PTO, seat, or some other kind of saftey switch isn't the problem? Do you hear the little lift pump in the back clicking when you turn the key on?

 

[radioman]

Its possible you have problems with your injector pump, but I've just never heard of this being a problem on BX's. Are you sure the PTO, seat, or some other kind of saftey switch isn't the problem? Do you hear the little lift pump in the back clicking when you turn the key on?

Hence the reason for my first post--- I asked if he observed the solenoid plunger moving or not when it shut off.

 

[dodge man]

Hence the reason for my first post--- I asked if he observed the solenoid plunger moving or not when it shut off.

I agree, I also think he is messing with something that should have been one of the last things to mess with. As far as I know, the BX's are self bleeding and don't reguire the cracking of any lines.

 

[fred98050]

here 2 videos:

MobileMe Gallery

 

[oldnslo]

here 2 videos:

MobileMe Gallery

Nice video, now can you connect at least one of the injectors externally to see what type of spray patten you get from the injector? That will tell you if you have enough pressure to operate the injectors and get a good fuel spray/mist into the cylinder. Spraying fuel out of the pump doesn't confirm working or plugged injectors.

Roy

 

[fred98050]

Nice video, now can you connect at least one of the injectors externally to see what type of spray patten you get from the injector? That will tell you if you have enough pressure to operate the injectors and get a good fuel spray/mist into the cylinder. Spraying fuel out of the pump doesn't confirm working or plugged injectors.

Roy

Oldnslo,

Thank you for the tip.
Just plugged an injector (new injector) to one of the line and NO SPRAY!!!

I am taking the injector pump to a shop for testing and most likely rebuilt cost estimate. Kubota wants $860 for a new one.

Thanks again :thumbsup:.

Frederic

 

[Willl]

to one of the line and NO SPRAY!!!

You are bleeding the air out of the hard line, correct ?

 

[fred98050]

You are bleeding the air out of the hard line, correct ?

Yes.
Thanks

 

[leonz]

WHOAH!!!!

Hold up there a minute Fred, if you installed a Brandy NEW injection nozzle on the female swivel there should have been a pencil thread or less diameter fuel spurt that would have blasted the paint off the motor!!!!!


The indirect injection fuel nozzle allows fuel to pass with no, I repeat no restrictions!!!!!


If they gave you a true diesel fuel injector this would happen because there is a night and day difference between an injection NOZZLE for an indirect injection engine versus a direct injection diesel fuel injector as the direct injection engines require(or did require) a spring backed fuel injector due to the higher fuel metering pressure.


Something is definetly wrong somewhere I wonder if the timing has jumped or the drive train in the injection pump is or was siezed or the o-rings seals are shot on the injection pump?

keep us in the loop :thumbsup:

 

[fred98050]

WHOAH!!!!

Hold up there a minute Fred, if you installed a Brandy NEW injection nozzle on the female swivel there should have been a pencil thread or less diameter fule spurt that would have blasted the paint off the motor!!!!!


The indirect injection fuel nozzle allows fuel to pass with no, I repeat no restrictions!!!!!


If they gave you a true diesel fuel injector this would happen because there is a night and day difference between an injection NOZZLE for an indirect injection engine versus a direct injection diesel fuel injector as the direct injection engines require(or did require) a spring backed fuel injector due to the higher fuel metering pressure.


Something is definetly wrong somewhere I wonder if the timing has jumped or the drive train in the injection pump is or was siezed or the o-rings seals are shot on the injection pump?

keep us in the loop :thumbsup:

Hmmm! Sorry I am not sure I get it...

I had a spare injector, I installed one injector line to the pump, installed the injector on the other end. Bled the line, I held a small jar around the injector and cranked the engine.
I couldn't see any spray nor could I see any fuel in the jar. Led me to believe that there wasn't enough pressure from the injector pump.

Also called Kubota today and I was told that they had seen an increase of pump failure due to Bio blend fuel. I never used any bio diesel but apparently here in WA, all the diesel fuel has a 5% bio..

I have the pump going to a shop tomorrow for testing. I'll definitely let you know what they find out.

Once this thing is fixed I'll installed a different fuel filter as you suggested..:thumbsup:

 

[kuboman]

Hmmm! Sorry I am not sure I get it...

I had a spare injector, I installed one injector line to the pump, installed the injector on the other end. Bled the line, I held a small jar around the injector and cranked the engine.
I couldn't see any spray nor could I see any fuel in the jar. Led me to believe that there wasn't enough pressure from the injector pump.

Also called Kubota today and I was told that they had seen an increase of pump failure due to Bio blend fuel. I never used any bio diesel but apparently here in WA, all the diesel fuel has a 5% bio..

I have the pump going to a shop tomorrow for testing. I'll definitely let you know what they find out.

Once this thing is fixed I'll installed a different fuel filter as you suggested..:thumbsup:

Bit a mystery alright. Just curious as to how and why the bio-diesel is causing pump failures. Lack of lubrication, water and dirt are what usually cause pump failures. Biodiesel has good lubrication and if you have a good filter dirt should not be the problem so...... Ask your dealer why?:thumbsup:

 

[fred98050]

Bit a mystery alright. Just curious as to how and why the bio-diesel is causing pump failures. Lack of lubrication, water and dirt are what usually cause pump failures. Biodiesel has good lubrication and if you have a good filter dirt should not be the problem so...... Ask your dealer why?:thumbsup:

I'll ask again but there was something to do with water...

 

[kuboman]

I'll ask again but there was something to do with water...

Biodiesel does attract water and also promotes algae growth which is another reason to have a good fuel filter. Personally I think the fuel filters on any of these tractors are a joke. One must be very careful with the fuel to keep it clean. I will also be very happy when this enviro-crap runs its coarse and we put diesel in our tanks and vegetable oil in the deep-frier.:thumbsup:

 

[Max Power]

Biodiesel does attract water and also promotes algae growth which is another reason to have a good fuel filter. Personally I think the fuel filters on any of these tractors are a joke. One must be very careful with the fuel to keep it clean. I will also be very happy when this enviro-crap runs its coarse and we put diesel in our tanks and vegetable oil in the deep-frier.:thumbsup:

amen ...... bio-diesel is not ready for the market.

here is the Kubota bulletin on it.

Kubota Engine America - Compact Diesel Engines