Our injection shop uses a diesel fuel injection test stand to ensure each pump meets specifications for fuel output and fuel metering. If you replace the plungers the barrels would need to be "re-timed" to ensure they are back to spec. It is possible to get lucky and snug them down and still be in spec, but there is no procedure to do so.

I would check and replace all fuels filter (may have a spin on & inline). Then I would try to identify what cause the fuel restriction. If it is grass, dirt, debris, etc. you would want to check the tank and make sure the screen in the tank is still present and make sure that when fueling there is not debris anywhere near the inlet when fueling. When blowing out lines to the tank it has a tendency to blow off the screen in the tank. If it is black/green it would be "algae" which would require you to treat with a biocide to prevent continued growth. "Algae" requires a higher water content to flourish in fuel, so you may want to check your fuel source for signs of water. It could be possible that the pump could have been damage prior to it being clogged as it it is a fuel lubricated pump with a very tight tolerance. If you need any further help feel free to reach out to us.

@@CountrySalesService thanks for the response. After all It was a mechanical pump causing issues. After I replaced it, the tractor started right away. I did pull the tank out and washed it. No screen has come out, except some gooey stuff.

Yes, we have a Full Service Injection Shop and offer our customers the option to utilize our Demand Remanufacture Process (even for most obsolete and discontinued injection pumps). We also offer remanufactured Injection Pumps, Injector Kits and High Pressure Common Rail PFR; Inline; Rotary; Fuel Systems to fit the following OEM's; • Bosch • Denso • Yanmar • Lucas • Stanadyne • Zexel Our remanufactured Injection Pumps & Injectors come with an industry-leading 1-year/unlimited-hour warranty. Let us know if we can help, find our website in the description!

Your delivery valve is either loose or bad. that cylinder could be on the injection cycle. if you turn the engine over it should stop.

The process for bleeding a Kubota Z482 is the exact same process as shown, just a few less cylinders. If the engine runs for 15-20 minutes and starts to cut out I would check 2 things; First if you have a manual lift pump on the engine, I would cap it off and bypass it with an electric lift pump. This would verify if it was (could be) a fuel supply issue. Secondly, if the engine cuts out, but you can immediately restart it, I would take a look at your stop solenoid. If you need any further help please give us a call.

Hello Kevin, Based on the information provided, I would guess one of a few things. The lack of smoke indicates that the engine is not getting fuel. This is can be caused by low compression (you stated it was good, what was the PSI you measured?). Since you indicated fuel is moving from the pump I would question the injectors. If you have not replaced them I would have them tested. Secondarily, though you may be getting fuel to the injection pump, you many not be getting the correct volume/pressure to the pump. If you have a manual lift pump I would inspect it to make sure it does not have a pinhole in the diaphragm (usually noticed if engine loses prime over a couple of days). Again, these are quick checks, I would need a little more history on the engine/machine to get a more pinpointed trouble shooting. If you need help, please feel free to contact us at 330-683-2500 and we can help you out!

My 4350 had a rat eat through low pressure line, I replaced it with a transparent yellow fuel line and it ran. As it got warmer it ran less well and I could see little air bubbles in the transparent tube. I live a distance from the dealer and would like to fix without breaking the bank. Any advice would be great.

@@scottheller1379 Hey Scott, Based on what you are telling me it is pulling air. It typically comes from one of a few places. First, you should have a have a manual lift pump. If it has a pinhole in the diaphragm you can get air entering the system. This is usually seen when the engine is recently run it starts right up, but if it sits for a while it takes longer to start as the pump is causing the fuel system to lose prime. Second, inspect the fuel filter/ fuel filter base and make sure that it is properly seated, no damage, nicked gasket, etc. Finally, if the delivery valve holders of the injection pump were turned or the O-rings have "dried out" you can get air in the system as well. Feel free to contact us if you have any other questions.

@@CountrySalesService thankyou so much. Am going to get a mobile mechanic out to help. Would let you guys but pretty sure the travel cost would be prohibitive lol. Again, thank you for your wisdom.

It sounds like you have a delivery valve that may be out of adjustment or the O-rings need to be replaced. With the barrel out of adjustment you will be getting more or less fuel (running rich or lean depending on the direction it was turned). You can try and snug down that barrel and see if you can get it to seal. If not the pump would need to be removed and repaired.

It sounds like the barrel is now out of adjustment, so when the pump is put into the "off" position it continues to pass fuel. It this is the case, just send it in to us and it is a quick simple fix, can get it back to you in a day or two.

@@CountrySalesService Thanks for this, I was out there today and moved the nut a few notches and that cylinder fire up with no issues (smoke) I locked it down there but if I still have probems I will be contacting you for service.

Hey, did you ever find an answer to this question?

​@@kylehammer2651no not yet but sense then the project had been on hold. Been busy doing other stuff and not had time to invest in this poriect

The clicking noise should be your fuel shut off solenoid turning on and off. That will make an electrical clicking sound

If it were here, we would replace the jet cock and the hollow screw (bleeder valve assembly). It should fix the issues and is not a difficult job.

We don't currently have a video for that, but will put it on the list!

Ever found out the problem. ?

Guy on video even said and questions. And no answer.

Hello, I would verify that you are getting the correct volume of fuel to the injection pump, should be between 5-8 PSI to fully supply the injection pump. If it is, then there is an issue with the injection pump. It could be a variety of reasons, it would be easiest to have it inspected and tested.

If you are referring to the lift pump (supplies fuel to the injection pump), it should be between 5-7 7 lb/in²

The valve lash for that engine is 0.18mm to 0.22mm, intake & exhaust, cold only.

It is usually one of 4 things; if you have a manual lift pump there is most likely a pin hole in the diaphragm, the housing of the injection pump is cracked, you have a leaking injector(s) or a barrel is damaged in the injection pump.

it has to be done on a test stand. You can send it to us and we can fit it for you.

@@CountrySalesService Hello . I have a problem with the engine rpm speed. When I start the engine rpm going high and I can't bring them back What could be the reason for this ?

could be a bad start solenoid if it has one or the fuel rack is stuck in the injection pump

@@CountrySalesService many thanks for the reply, i strongly suspect the fuel rack, as i can only move the throttle lever a fraction that it used to move, hope you are well.

i believe he was demonstrating as if installing a new/rebuilt pump, best to verify it pumps & shuts off before installing the lines

Thanks!

Glow Plugs are for cold weather starting, and aren't needed once the engine is capable of staying running. I work on Diesel's in -40 temps and a kubota is one of the best engines to get running.

@@RealSprooseMoose After posting my findings are "Starting assist" not what I thought ~ very moderate conditions so your advice is that if I keep battery charged and it will "catch" ( begin operation ) to ignore carbon cloud and other things and not use them at 40° F - correct?

So a couple of things on this, if bio diesel was used I would guess the injectors are bad. Maybe even pump and rail. But before I could diagnose it I would need to see what the actual (p) codes that are in the ECU. That would tell me if its fuel or electrical.

Thank you for replying I was able to replace the thermo senors and got the dpf resolved. I still have the code “64 Engine system” code once I plug in the diesel laptop the code high rail pressure is still up. I order new fuel filters both primary and secondary the clear one. I am going to drain the whole tank. Then add 911 diesel. The customer stated he did use bio diesel and this mini ex has been sitting for 3 months. So that would be an issue. I’m still holding off on the fuel injectors thank you again!