Page 1 of 2 12 LastLast
Results 1 to 10 of 16
  1. #1
    Platinum Member
    Join Date
    Jan 2007
    Posts
    614
    Location
    Creal Springs, IL
    Tractor
    Kubota M7040, ZD326, JD Gator 855D

    Default Tuthill diesel pump problems

    Had this pump for about 1 1/2 years, pumping from truck aux tank to mower, gator, tractor. Hasn't really pumped that much either. Worked great....until today. Runs, just stopped pumping. I'd use maybe a week ago, worked fine.

    Took it apart limitedly, don't see issues. Checked the drawing line...no cracks etc. Tried to pull diesel from mower to gator, when I immersed the hose deeper into diesel. Testing suction directly at the pump with my finger, there simply isn't any.

    Here's the pump and the inside...little white plastic pieces easyily pull out, don't look damaged. Didn't take it apart any further. To me the inside looks fine. Somebody tell me what's wrong and how to fix.




  2. #2
    Gold Member
    Join Date
    Nov 2010
    Posts
    372
    Location
    Frozen part of WI
    Tractor
    John Deere 855

    Default Re: Tuthill diesel pump problems

    Hmmmmm..... If you run the pump and there is no suction, I got to think it is an air leak somewhere....

    Can you immerse the suction end in a 5 gallon container of fuel... Wrap a rag around the opening and add a little compressed air to the container so it can get fuel to the pump.... If it pumps OK then shut off pump... Try to restart the pump... If it quits pumping on it's own, or won't restart pumping, I suspect air leak on the suction.... If there isn't a check on the discharge, plug the suction end of the hose, immerse the suction in fuel and again, wrap a rag around the discharge and put compressed air backwards through the pump to see if there are bubbles...

    Are those pump veins spring loaded to seal against the pump body wall ?? If so, are they keeping the veins tight there... ??

    Bound to be something simple, just not easy to diagnose.....

    Good luck...

  3. #3
    Platinum Member
    Join Date
    Dec 2012
    Posts
    528
    Location
    Apex nc
    Tractor
    Kioti Dk45SE and Kubota BX 2200

    Default Re: Tuthill diesel pump problems

    Try priming it.

  4. #4
    Platinum Member
    Join Date
    Jan 2007
    Posts
    614
    Location
    Creal Springs, IL
    Tractor
    Kubota M7040, ZD326, JD Gator 855D

    Default Re: Tuthill diesel pump problems

    Quote Originally Posted by nc redneck View Post
    Try priming it.

    I thought about doing that, but this pump is self priming...and I always flush the pump before pulling from the aux tank to avoid the diesel mess....but I will try that. If it has lost its self priming capabilities....I'll need to change my setup somehow.

  5. #5
    New Member
    Join Date
    Apr 2014
    Posts
    4
    Location
    Leeds
    Tractor
    None

    Default Re: Tuthill diesel pump problems

    The 5 blades seem to be made of Nylon and may have absorbed Diesel over time and swolen slightly. If so they will seal better inside the rotor slots and a higher vacuum will be created underneath the blades stopping the blades from maintining contact with the pump body bore. If that is the case the pump will not self prime anymore or even stop pumping altogether even when primed. To overcome this problem the 5 blades should have some grooves on their leading face connecting the cavity underneath the blades with the pumping chamber to allow Diesel to flow freely underneath the blades and thus preventing a vacuum.
    A less likely cause could be if the pump is running too slow.

  6. #6
    Platinum Member
    Join Date
    Jan 2007
    Posts
    614
    Location
    Creal Springs, IL
    Tractor
    Kubota M7040, ZD326, JD Gator 855D

    Default Re: Tuthill diesel pump problems

    I agree the blades are of nylon. They move freely in the slots, centrifugal force pushes them out, there are no springs etc. They don't seem swollen. The grooves you mention are built into the blades. To me...everything 'looks' normal.

    BUT...I did what redneck said, I primed it (messy) and got it to pump. The way I use this pump, I simply push the inlet hose into the aux tank, and the pump self primes. I lose the prime after every use. SOO....I'm thinking I need to change my setup and discontinue coming from the truck. I've seen setups on this forum using the same pump I have using those blue barrels. That way I won't lose the prime after each use.

    Is it normal after a low usage of this pump for 1 1/2 years to do this?

  7. #7
    Super Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Posts
    7,890
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Tuthill diesel pump problems

    I would look at the little white plastic vanes. If those are really free enough to slide out. In the photo, 3 of them should be out next to the pump side wall but are still in the impeller part. Remove them and check for any little pieces of grit that may be producing some friction. If the impeller is turning, and those vanes are moving, it should pump.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  8. #8
    Super Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Posts
    7,890
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Tuthill diesel pump problems

    It also looks like your rubber O-ring is bad. Replace that also. I would think that they make a repair kit for those pumps to include the vanes and O-rings.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  9. #9
    New Member
    Join Date
    Apr 2014
    Posts
    4
    Location
    Leeds
    Tractor
    None

    Default Re: Tuthill diesel pump problems

    Quote Originally Posted by jcummins View Post
    I agree the blades are of nylon. They move freely in the slots, centrifugal force pushes them out, there are no springs etc. They don't seem swollen. The grooves you mention are built into the blades. To me...everything 'looks' normal.

    BUT...I did what redneck said, I primed it (messy) and got it to pump. The way I use this pump, I simply push the inlet hose into the aux tank, and the pump self primes. I lose the prime after every use. SOO....I'm thinking I need to change my setup and discontinue coming from the truck. I've seen setups on this forum using the same pump I have using those blue barrels. That way I won't lose the prime after each use.

    Is it normal after a low usage of this pump for 1 1/2 years to do this?
    From what you say there is no doubt that there is an air leak. This is not likely to be in the suction pipework because you would have noticed it. The blade tips have hardly worn looking at the photo, so there is no problem. My guess is the blades have worn lengthwise and this will reduce the required vacuum at the suction side and stop the pump from priming. If this is the case, then a new set of blades would solve your problem for another 1 1/2 years. Very little extra blade clearance will loose you your vacuum. If there are some abrasive impurities in the Diesel I would consider fitting an inlet filter. If a check valve in your inlet pipework would not interfere with your mode of operation I would fit one; that would keep your pump flooded. Ask the manufacturer what the axial blade clearance in a new pump is and then measure your blades and compare. Every thousands of an inch counts.
    It is not the 1 1/2 year usage that matters, rather how many hours the pump has run. From my experience this type of pump will see some priming loss after 1000 hours running on low viscosity liquids containing no abrasive particles.

  10. #10
    Platinum Member
    Join Date
    Dec 2012
    Posts
    528
    Location
    Apex nc
    Tractor
    Kioti Dk45SE and Kubota BX 2200

    Default Re: Tuthill diesel pump problems

    I have the same pump with less than 4 hours of use. I dont think it can self prime at much over 6 to 12 inches. First start up they probably have 90 weight gear oil in it and it self primes. After that you are on your own. It is a cheap $ 100.00 dollar pump. If you can get supply to gravity feed into it, it will work well and probably for a long time.
    Thanks
    Scott

Page 1 of 2 12 LastLast

Similar Threads

  1. john deere 455 lawn tractor diesel fuel pump problems
    By lwalker in forum John Deere Lawn & Garden
    Replies: 6
    Last Post: 08-27-2013, 04:15 AM
  2. mf 135 diesel lift pump replacement problems
    By Bigd7400 in forum Massey Ferguson Classic/Vintage
    Replies: 4
    Last Post: 05-13-2012, 09:04 AM
  3. Tuthill transfer pump
    By countrybumpkin in forum Owning/Operating
    Replies: 4
    Last Post: 10-20-2009, 05:06 PM
  4. tuthill fuel pump ??????????
    By whitearrow in forum Oil, Fuel & Lubricants
    Replies: 6
    Last Post: 05-12-2006, 03:36 PM

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.