walker with 16hp kolher

Discussion in 'Mechanic and Repair' started by LawnInOrder, Aug 22, 2007.

  1. LawnInOrder

    LawnInOrder LawnSite Senior Member
    Posts: 398

    heres my problem. I am not getting fuel from the gas tank to the carb. I broke down the carb and cleaned it out since it was sitting for 4 years It has a mechinacal fuel pump between the tank and carb. when i take the fuel pump off the motor and pump the fuel pump by hand it works but when it is bolted up to the motor it doesn;t get fuel to teh carb. This machine has been sitting for 4 years. What do you gusy think? Let me know.
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Sounds like the pump diaphragm is hard, It's working in your hand because you are giving it more stroke than the lobe does. Or it could be a worn lobe.
     
  3. LawnInOrder

    LawnInOrder LawnSite Senior Member
    Posts: 398

    how would you test to see if it the diaphram or a lobe. Thanks
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    First what model engine is this ?
     
  5. LawnInOrder

    LawnInOrder LawnSite Senior Member
    Posts: 398

    its a 16 hp magmum kolher
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Thats what I had in my mind, You can remove the plug(s) then stick a standard screw driver into the pump hole touching the cam then rotate the engine by hand and watch how much movement you have on the handle.

    There are no specs on this but you should get a good idea if it is moving enough to activate the pump.

    Is this a M or MV, Single or twin ?
     
  7. LawnInOrder

    LawnInOrder LawnSite Senior Member
    Posts: 398

    this is a single.
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    The above check will apply, I have seen a couple with worn lobes but I would lean toward the pump. You could take the pump apart just to check after you check the lobe but they no longer sell rebuild kits that I know of.
     
  9. LawnInOrder

    LawnInOrder LawnSite Senior Member
    Posts: 398

    when i take the diaphram apart what do i look for: something broken, torn, scratched?. also how much do these pumps usually go for? thanks
     
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    A new pump is in the $70.00 range, The diaphragm should be soft and pliable not hard and stiff.
     

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