It's not a truck but it is on solid ground and has a motor.

Discussion in '4x4 / Truck Forum' started by Mudbug, Dec 17, 2021.

  1. Mudbug

    Mudbug Senior Refuge Member

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    Nope, not the Muddy dog it runs great.
    [​IMG]

    BUT
    We have an old Polaris indy 400.
    The backup gear is messed up, and I had to replace the gasket to keep in the oil. I did not want to spend $400 on a $100 sled so we have no reverse. The starter drive was so gummed up it would not slide into the flywheel gear, I fixed that and lubed it with my forming chain lube.
    It ran fine last year, this year we found the battery had frozen and split, we fixed that.
    Now it turns like nobody's business.


    BUT Here is the problem It does not fire up.


    I put in new gas and used starting spray.
    Nothing.
    I pulled the plugs there used and black but I thought they should still work, I cleaned them.
    Grounded them on the head and spun it over, no spark at all, on either.
    I checked the kill switch and it is in the run position.
    Where should I look this happened when it was parked all summer, in fact, I started it once this summer.
    The first thing I'm thinking is to change the plugs there probably 15 years old.
    What should I look at next if they don't take care of the problem?
    Whenever something happens out of the blue after I have done some work on it is to question if I did something. Your learned opinion is greatly appreciated.
    We have a good of new snow here and cold.
     
  2. Aunt Betty

    Aunt Betty Elite Refuge Member Supporting Member

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    Is it a magneto system or does it have a coil?
    Check that. Maybe something is loose.
    Probably something simple like a mouse chewed a wire maybe?
     
  3. Mudbug

    Mudbug Senior Refuge Member

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    magneto system It will run without a battery.
    No mice.
    New plugs did not change anything.
    I'm going to try and track back the kill system.
     
  4. Mudbug

    Mudbug Senior Refuge Member

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    I was looking the wrong way!
    I was fiddling with the wire harness, and a plug came apart.
    I put it back together and I had a spark to both plugs.
    Way cool!
    But it still will not run, but it fires now.
    It will run as long as the raw gas I put into the cylinders lasted.
    There is no gas in the filter.
    I can run gas through it If I pour it in, not plugged.
    We drained the tank and maybe found some water, it's above freezing today.
    New gas, still not getting to the carb?
    If I elevate the fuel line and filter and fill the filter It will run till the gas is gone.
    SO in my mind, the fuel pump is not lifting the gas out of the tank.?
    I ordered a fuel pump and filter.
    We will see if it works.
     
  5. Telazol

    Telazol Refuge Member

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    Sounds like it is a fuel pump issue. I had an old Nova that I had to pour gas straight into the carb to fire the engine and get the pump primed to start pulling gas from the tank.
     
  6. Mudbug

    Mudbug Senior Refuge Member

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    YUP changed the pump, in-tank pickup tube, and filter. Runs great
     
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  7. Tuleman

    Tuleman Elite Refuge Member

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    Keep looking. You cannot prime a car's fuel pump by pouring gas down the carb.
     
  8. Telazol

    Telazol Refuge Member

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    You can't?

    So I wasn't actually priming the pump?

    It wouldn't crank w/out a bit of gas poured in the carb, after which it idled fine. What would be the issue?
     
  9. Tuleman

    Tuleman Elite Refuge Member

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    No, you can't.
    That's right; you weren't.
    If it wouldn't crank (turn over), then fuel wasn't the problem.
    If it would crank (turn over), but not start until you poured gas down the carb, then I'd say the carb's float bowl had gone dry and you didn't give it enough cranking time to fill it before pouring gas into the carb.
    Gasoline cannot reach the fuel pump from the carb throats.
    It's also possible that the fuel pump had a small leak in the diaphram and wouldn't pump gas until the engine started and was turning enough rpm to make it move fuel. (The starter couldn't turn it over fast enough to overcome the leak.)
     
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  10. Tuleman

    Tuleman Elite Refuge Member

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    And, if that is the case, you need to check your oil for dilution from gasoline.
     
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