M9000 bio-diesel issues

LeicaShooter

New member

Equipment
M9000
Apr 12, 2026
7
2
3
Central California
Good day all, new poster here.
Last year I my M9000 circa early 2000's suffered a clogged fuel filter from bio-diesel and limited use. Someone else has been working our orchard so I've not used the Kubota all that much. While using it, the engine sputtered to a stop and found the fuel filter full of thick gunk from what I gather is caused by bio-diesel garbage they put in the fuel in Kaliphornia. To date (shows that I'm not in a real hurry), been almost a year now. I've changed the filter, cleaned out both tanks, replaced fuel lines that were too old and brittle. Cleaned out the filter housing, water separator, replaced the fuel level sensor. I've blown air through the house towards the tank to ensure it is fully clear and flowing. (low pressure).
So now I am having trouble purging the air out of the system. I've opened the small valve on the fuel distribution module that feeds the individual cylinders. Then use the pump on top of the fuel filter housing. The pump itself goes down easily, but is slow to return to the top. (Could it still be plugged up inside?). I was not able to fully disassemble this unit, the Phillips screw on the handle just turns and found no way to get a look inside completely.
Would an electric fuel pump help in this situation? Since the tanks sit below the running boards....can't gravity feed the fuel like some tractors. I did use a syringe and feed some fuel directly to the distribution module and it ran briefly.
Sorry for the long winded convoluted post. Not an expert by any means on diesels, although I want to learn.
 

GreensvilleJay

Well-known member

Equipment
BX23-S,57 A-C D-14,
Apr 2, 2019
13,746
6,237
113
Greensville,Ontario,Canada
hmm, others will know better, but maybe you'll have to remove and clean the steel lines between the Injector pump and cylinders ? Could be 'bad fuel' is coating the inside of those lines ??
 

LeicaShooter

New member

Equipment
M9000
Apr 12, 2026
7
2
3
Central California
I pulled the steel lines, they're all clear. Able to blow air through them cleanly. Left them off to see how well the pump would shoot diesel out. Only 3 & 4 work currently. Looks like I'll have to pull the top of the pump off to see what the issue is with 1 & 2. Any suggestions before I pull the top off? There are two Torx screws holding plates on the pairs of ports to hold the bolts (I believe), then the top plate has 12 or 13mm bolts holding it down to the body of the pump.
 

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Russell King

Well-known member
Lifetime Member

Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Jun 17, 2012
7,510
2,841
113
Austin, Texas
I personally would never open an injection pump. I would take or send it out for repair since I have limited knowledge on repair, no proper equipment for repair and testing the pump.
 
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North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
35,411
10,608
113
Sandpoint, ID
DO NOT open the injection pump!
You will not get it set properly.

Back up a little and get some Soltron (go to NAPA to get it) or another algicide/ biocide and treat the tank and any of the fuel system you can get fuel to flow through.
Pull the fuel line that feeds the injection pump and bottle feed it biocide straight into the injection pump crank it a bit to move it all around in the pump and let that sit for at least a day or so.
 
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LeicaShooter

New member

Equipment
M9000
Apr 12, 2026
7
2
3
Central California
Ok, latest update and solution. When I had previously cleaned the pump/fuel filter housing, I thought it was good to go. Took it apart again yesterday and noticed small deposits on and around the gasket at the top inside of the unit. It is impossible to get to, let alone clean properly. When I press on the pump button, I hear air leaking through this gasket. Thus it would never pump enough fuel properly into the system from the tank. Went to the dealer and purchased a replacement for $140. Installed it, primed the system, tractor turned over a few times and then started. Let it run for 15-20 minutes, opened the throttle a few times, purrs like in the past. Hearing the turbo spool up is nice.
Can't wait to put it all back together and get it back to working the farm. Thank you all who responded and for the suggestions, answers, advice, etc.
 
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