1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

Propane problem

Discussion in 'Forklifts/Telehandlers' started by Old Doug, May 26, 2020.

  1. Old Doug

    Old Doug Senior Member

    Joined:
    Oct 16, 2013
    Messages:
    1,460
    Location:
    Mo
    We have a older forklift it will start and run for about 10 minutes then die then it will run about 30 seconds die start die until it sits then it will run 10 minutes and die. It will run on gas not real good it hasnt been on gas in years. It has a vacuum LP valve that is working and the converter is new. I put a low presser gauge on the converter and it has presser even after it dies. Its also fireing the plugs after it dies. I have worked on alot of LP engines but never had this problem.
     
    DMiller likes this.
  2. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    787
    Occupation:
    HD Mechanic/Shop Foreman
    Location:
    Alberta, Canada
    Do you have a good flow of hot water (coolant) to the propane converter? Sounds like it might be freezing up on you.
     
    hosspuller, TD24 and DMiller like this.
  3. Old Doug

    Old Doug Senior Member

    Joined:
    Oct 16, 2013
    Messages:
    1,460
    Location:
    Mo
    The converter is hot so i dont think that is happening and it always has presser on the test port of it. They were useing it today i need to adjust the gas carb or get the propane to working.
     
    DMiller likes this.
  4. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    787
    Occupation:
    HD Mechanic/Shop Foreman
    Location:
    Alberta, Canada
    try pulling off the fuel hose from the converter to the carburetor when it dies, crank the engine over and see if you have fuel (vapour) flowing out of the hose. That will narrow it down as to what part of the system is acting up - supply or mixer. Is it an electric or vacuum lock valve?
     
    DMiller likes this.
  5. Old Doug

    Old Doug Senior Member

    Joined:
    Oct 16, 2013
    Messages:
    1,460
    Location:
    Mo
    I have tryed that and it does have propane i even put a low presser gauge in the line and it had presser for a while after it dies.
     
  6. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    787
    Occupation:
    HD Mechanic/Shop Foreman
    Location:
    Alberta, Canada
    It's got to be in the mixer then, or what ever metering device is above the carb.
     
  7. Old Doug

    Old Doug Senior Member

    Joined:
    Oct 16, 2013
    Messages:
    1,460
    Location:
    Mo
    I have been working on it some every day this week but got no were. I found out that i can start it on propane it runs good for maybe 15 minutes then starts running ruff then it will die then i can switch it to gas and it will run for a while and it will start running bad and maybe die. I have tested to see if it had fire at the sparkplugs and it has spark but it is hard to see or is maybe weaker than when first started. I thought maybe low voltage to the dist but it always has 12 volts. I am thinking about buying a new dist.
     
  8. Theweldor

    Theweldor Senior Member

    Joined:
    Feb 17, 2018
    Messages:
    470
    Location:
    Western, NY
    How about a condenser?
     
    DMiller likes this.
  9. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    787
    Occupation:
    HD Mechanic/Shop Foreman
    Location:
    Alberta, Canada
    Is it point or electronic ignition? What you describe is almost classic electronic ignition bad stator coil. They crap out when hot, run again once they cool off.
     
    DMiller and Theweldor like this.
  10. Vetech63

    Vetech63 Senior Member

    Joined:
    Aug 10, 2016
    Messages:
    2,294
    Location:
    Oklahoma
    Have you checked the propane filter? Sorry, didn’t see the ignition issue til after I posted.
     
    mg2361 and DMiller like this.
  11. Old Doug

    Old Doug Senior Member

    Joined:
    Oct 16, 2013
    Messages:
    1,460
    Location:
    Mo
    Its electronic one hot wire to the dist coil is built in to it. It does sound like a dist problem but i never saw one act this way.
     
  12. DMiller

    DMiller Senior Member

    Joined:
    Feb 22, 2010
    Messages:
    7,609
    Occupation:
    Retired
    Location:
    Hermann, Missouri
    If a points and condenser distributor is either the condenser or the resistor block (some are built into the coil), reduces voltage at the points to around 9v, bad or weak condenser will do this.
     
  13. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    787
    Occupation:
    HD Mechanic/Shop Foreman
    Location:
    Alberta, Canada
    so it's GM style HEI ignition? Check your cap & rotor. They burn up real bad.
     
    highwayghost and DMiller like this.
  14. DMiller

    DMiller Senior Member

    Joined:
    Feb 22, 2010
    Messages:
    7,609
    Occupation:
    Retired
    Location:
    Hermann, Missouri
    Center contact is bad for self destruction, then affects coil. If a Hall effect like a Chrysler the small coil under the rotor goes to hellandgone.
     
  15. Old Doug

    Old Doug Senior Member

    Joined:
    Oct 16, 2013
    Messages:
    1,460
    Location:
    Mo
    I think monday i will order a new dist that will ether fix it or narrow it down.
     
    DMiller likes this.
  16. farmerlund

    farmerlund Senior Member

    Joined:
    Nov 23, 2014
    Messages:
    643
    Occupation:
    Farmer/ excavator
    Location:
    North Dakota
    if it has an external coil it could be that. I have had one act like that on a ford pickup. runs cold dies after 30-45 min. cool it off and runs again.
     
    DMiller likes this.