Page 1 of 2 12 LastLast
Results 1 to 10 of 14
  1. #1
    New Member hthomure's Avatar
    Join Date
    Jun 2009
    Posts
    21
    Location
    Central Missouri
    Tractor
    Kubota B2910

    Default Kubota B2910 Fuel Gauge Not Working

    The title of the tread says it all. My fuel gauge always says "full." I'm assuming there's a float in there that's stuck, but don't really know much about it, so I don't know where to begin troubleshooting. Any suggestions?

    The sypmtoms are: The fuel gauge always says "full," except when the key is off, then it does move to "empty." So I guess at least I know it's not the needle itself.

    Thanks.

  2. #2
    Silver Member aggiehortguy91's Avatar
    Join Date
    Feb 2009
    Posts
    120
    Location
    Jupiter, FL
    Tractor
    '01 BX2200

    Default Re: Kubota B2910 Fuel Gauge Not Working

    The sending units in both tractors and boats are notorious for going bad. I have never figured out why manufacturers don't use a better sender for these. My BX always reads about 3/8 of a tank, but the process to remove and replace the sending unit is far more difficult in my case that it is worth so I just keep a mental track of fuel use and top off the tank when in doubt.
    BX2200 w/ turf tires, LA211 loader, 4' box blade, and 60" MMM

    Shh! Don't tell her she's a little tractor.....she doesn't know

  3. #3
    Silver Member
    Join Date
    Mar 2009
    Posts
    150
    Location
    Port Alberni BC
    Tractor
    1972 IH 454

    Default Re: Kubota B2910 Fuel Gauge Not Working

    If you'r fuel gage allways reads full, I would suspect that you have a bad ground. Unless it's wired differntly than a car. If you can get at the sending unit, dis conect the wire, test for power, if power, then scratch a good ground, see if the neadle goes down.

  4. #4
    Platinum Member
    Join Date
    Apr 2007
    Posts
    592
    Location
    Northern Lower Michigan
    Tractor
    Kubota B3030HSDC

    Default Re: Kubota B2910 Fuel Gauge Not Working

    Sounds more like the power wire is broken/bad connection,etc.My years with trucks,that was always the problem.Good Luck!Post back.

  5. #5
    New Member hthomure's Avatar
    Join Date
    Jun 2009
    Posts
    21
    Location
    Central Missouri
    Tractor
    Kubota B2910

    Default Re: Kubota B2910 Fuel Gauge Not Working

    Thanks folks. I tore into it and pulled the sending unit and cleaned everything up, making sure all the contacts were good, and when I put it back together, it seemed to be working fine. Didn't have to replace anything, fortunately.

    Now I have to figure out why the cruise control quit working.

  6. #6
    New Member hthomure's Avatar
    Join Date
    Jun 2009
    Posts
    21
    Location
    Central Missouri
    Tractor
    Kubota B2910

    Default Re: Kubota B2910 Fuel Gauge Not Working

    Ok, scratch that. I fixed the cruise control, but halfway back to my farm, the fuel gauge quit working again. It had been working great, then all of a sudden, it just jumped back up to "full."

    Ground problem, I'm guessing. But all the contacts were clean when I put it back together. God, I hope it isn't at the other end of the wire. I'll never find it.

  7. #7
    New Member hthomure's Avatar
    Join Date
    Jun 2009
    Posts
    21
    Location
    Central Missouri
    Tractor
    Kubota B2910

    Default Re: Kubota B2910 Fuel Gauge Not Working

    I've been thinking about it, and what I might do is just make a new ground. I'll fasten a new wire to the body of the tractor and call it the ground and see if that works. That's a lot easier than trying to track down a loose wire.

  8. #8
    Silver Member
    Join Date
    Mar 2009
    Posts
    150
    Location
    Port Alberni BC
    Tractor
    1972 IH 454

    Default Re: Kubota B2910 Fuel Gauge Not Working

    Do you have power at the sending unit when it reads full? If yes, it's a bad ground or it's the sending unit. Do you have power on the ground side of the sending unit? If yes it's a bad ground, if no, it's your sending unit.

  9. #9
    New Member hthomure's Avatar
    Join Date
    Jun 2009
    Posts
    21
    Location
    Central Missouri
    Tractor
    Kubota B2910

    Default Re: Kubota B2910 Fuel Gauge Not Working

    That makes sense. I'll approach my next check of it with that in mind. I only know two things right now: One, when the ignition is off, the needle reads "empty." When I turn it on, it goes to "full." That tells me it's at least getting power. Two, when I took it apart and cleaned the contacts and put it back together, it worked until I got a couple of miles down the road with it, then it just quit working and the needle shot back up to "full."

    The unit had a little rust on it when I checked it, but the arm moved freely, and it worked for a while. I would think the sending unit would either work or not, not work some of the time and not work at other times.

  10. #10
    Gold Member
    Join Date
    Jul 2004
    Posts
    357
    Location
    People's Republik of Maryland
    Tractor
    B2910

    Default Re: Kubota B2910 Fuel Gauge Not Working

    Here is a quick blurb from a jeep site that briefly describes the fuel sender/fuel gauge system. I belive the tractor should be set up similarly.

    Dave

    This link is pretty straightforward.

    http://www.aa1car.com/library/fuel_gauge_diagnosis.htm

    Here is the text from the jeep site

    The fuel sending unit wires are located on top of the gas tank
    where they are hard to get to without dropping the tank. The fuel sending unit should have a pink wire with voltage on the isolated center post. The other black wire on the sending unit with a tab style connector is a ground to the frame. Make sure it has good contact.

    To be sure the problem is not the gauge, you can momentarily short the pink wire on the output of the sender to ground, and this should show up as FULL on your gauge. DO NOT hold it for very long in this position, just touch and release the wire. If the gauge does not move from EMPTY either the wiring has an open circuit (no voltage, or no connection to ground) or he gauge is bad. If it does move, the sending unit is bad.

    The sending unit can be checked with an ohmmeter to measure the resistance between the round sender post (pink wire) and ground. It should be:

    Resistance Reading
    73 ohms Empty
    23 ohms 1/2 tank
    10 ohms Full

    If the resistance falls in this ballpark (depending on how much gas you have in the tank), then the sending unit is fine. If it shows infinitely HIGH resistance, then the sending unit could be bad OR the wire from the tank to the gauge could be open.

    The gauge can be tested with the resistance listed above. Run an appropriate resistor to the S terminal of the fuel gauge and to ground and check the readings.
    Last edited by QueBota; 07-09-2009 at 04:30 PM. Reason: can't spell

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.