(800) 853-2651
SHOP NOW

Kubota M4900 died????

Tx Jim

Tx Jim

Well-known Member
Location
Coyote Flats, Texas
I would have asked this question on Today's Tractors Forum but it seems not as many members visit it. My Kubota died while loading a rd bale of hay. It has saddle tanks under the cab and supplies inj pump from RH tank. I can't seem to get good flow from the tank. I've blown compressed air into fuel supply line and then into fuel tank filler neck. Air will go in supply line and bubble in the tank but no air or fuel will come out supply line when blowing in filler neck. I filled tank all the way up to see if that would help but no change. Can the rubber fuel cause blockage only in one direction similar to a diode?? Thanks,Jim
 
Check all your filters. There may be a little strainer that goes "inside" one of the banjo fittings. I know on the M6030 there is one on the water seperator. They can plug up solid but I would think that would prevent all fuel flow not one direction.
 

I know about the water separator as I had a fitting in it stop up last year. I can't get fuel from the supply line coming from tankthat is supposed to be connected to water separator(no fuel coming out of tank). Fuel is supposed to come out of top of tank according to parts schematic as Kubota tech manual is of little help.
 
You may have blockage inside the tank. You may need to drain the tank if fuel doesn't flow from the supply line. Sounds like something is blocking the outlet. Use a clean container to catch the fuel. You may have some hay or straw
in the tank. We had that problem at work and found a red plastic plug in the outlet and it took some effort to get that out of the outlet.
We had to drain and pull the tank. We used a transfer pump off a B29 airplane to empty the tank. Hal
 
rubber hoses can delaminate internally and the flap
can act like a heart valve. Take the line off at
the tank to see if the issue is in the tank (junk in
tank) or the hose. Jim
 
I have a M6800, with saddle tanks like yours, and
mine has a lift pump to move the fuel from the
tank to the injector pump. You could check that,
and you could also try getting a cheap 12V fuel
pump from an auto parts store to verify that fuel
can move out of the tank. Maybe try running
without the fuel cap on, to make sure the tank
vent isn't blocked?

I had a problem last summer where the check-valve
in the return line became clogged. The tractor
would run for up until an hour, at which point it
would just die.
 
(quoted from post at 11:44:13 02/18/12)
you could also try getting a cheap 12V fuel
pump from an auto parts store to verify that fuel
can move out of the tank. Maybe try running
without the fuel cap on, to make sure the tank
vent isn't blocked?

I had a problem last summer where the check-valve
in the return line became clogged. The tractor
would run for up until an hour, at which point it
would just die.
Click to expand...

Thanks for reply. I haven't found a cheap 12v lift pump but I've had one on my Kubota to aid priming the fuel system when changing fuel filter. The vent is open and I've also tried with no fuel cap. Where is this check valve in the return line??
 
(quoted from post at 09:18:05 02/18/12) rubber hoses can delaminate internally and the flap
can act like a heart valve. Take the line off at
the tank to see if the issue is in the tank (junk in
tank) or the hose. Jim
Click to expand...

Thanks for your reply. I just got back from town buying some new fuel line hose to replace all existing hose.
 
Just start taking things apart back to the tank until you find the problem... I don't know if that one is a top siphon or bottom draw tank... but if draws off the bottom a shop vac stuck loosely in the filler neck will facilitate the removal of the tank outlet/valve without loss of fuel. The Ford's would commonly plug up their outlet strainer or the tank shutoff valve... so that would be a thought on a starting point.

Rod
 

According to the parts schematic the fuel is drawn out of the top of the tank. It's raining hard right now so when it stops raining I'm going to replace the fuel hose from the tank to the water separator. Praise the Lord for the rain.
 
Another thing to look at is the fuel shutoff solenoid. When they start failing they will show similar symptoms. You might overlook it because when you turn on the key you can hear it "click" as it engages. That doesn"t mean it stays engaged. Just try bypassing it. I went through a similsr problem with a M 6200 last summer.
 
Do you know if the lift pump is working correctly? Will it lift from a can? If it does I think I'd try and get at the siphon in the tank...

Rod
 

I can't get fuel from tank long before any shutoff valves/filters or pumps. I can blow air into the fuel hose just in frt of cab that leads directly to tank and air will bubble in the fuel in the tank BUT I can blow in the filler neck with a rag stuffed in the hole to block escaping air and no fuel will flow out of the fuel line leading to water separator. Therefore when it stops raining I'm going to R&R fuel hose going to tank with new hose.
 
I suspect that the air is easily escaping around the rag when you try to pressurise the tank... at least to the extent that you're not going to force fuel up a siphon tube... The fact that you're only getting bubbles in the tank kinda suggests to me that there is a restriction there... as it should blow fuel back out the filler neck when you do that with a 1/4" line.
Also be carefull applying air to a tank like that. It doesn't take much to swell them.... believe me.
Personally I'd still want to know if the fuel pump can lift fuel from a jerry can before I invested much time ripping and tearing at the tank or the lines under the cab...

Rod
 
as it should blow fuel back out the filler neck when you do that with a 1/4" line.
Also be carefull applying air to a tank like that. It doesn't take much to swell them.... believe me.Rod
Click to expand...

The fuel tanks are metal saddle tanks. Blowing air into outlet line and listening at fuel filler neck is a 2 person operation as line is on one side and filler neck on other side of tractor. One time my helper applied too much air in too short of a period and fuel did blow out the neck. Not only can I not get fuel out of supply hose but no air either while blowing in tank neck. Thanks for the reply.Jim
 
(quoted from post at 08:59:39 02/18/12) I would have asked this question on Today's Tractors Forum but it seems not as many members visit it. My Kubota died while loading a rd bale of hay. It has saddle tanks under the cab and supplies inj pump from RH tank. I can't seem to get good flow from the tank. I've blown compressed air into fuel supply line and then into fuel tank filler neck. Air will go in supply line and bubble in the tank but no air or fuel will come out supply line when blowing in filler neck. I filled tank all the way up to see if that would help but no change. Can the rubber fuel cause blockage only in one direction similar to a diode?? Thanks,Jim
Click to expand...
bsolutely. Even with much higher pressures. Few years back, had rt front caliper that wouldn't release on a '92 2500. Replaced caliper, same problem. Replaced hose & fixed it. Couldn't blow air thru that hose.
 
You must log in or register to reply here.

Similar threads

W
JD 45 combine fuel pump won't prime.
Replies
7
Views
517
Jim.ME
J
J
Ford 3600 Diesel Loses Power/rpm Under Load
2
Replies
26
Views
2K
jedoga
J
O
John Deere 6300 started fine then died haven't run sinc
Replies
2
Views
563
OL" Bob
O
T
IH 385. Won't stay running.
Replies
6
Views
991
The Famous Grouse
T
Q
YM 1500 died and now won’t start
Replies
0
Views
5K
Aaron-HT
A
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top