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Thread: 59 340 utility (gas) starts but only runs a few mins at at time

  1. #1
    Join Date
    Dec 2009
    Posts
    3

    Default 59 340 utility (gas) starts but only runs a few mins at at time

    59 340 utility (gas) starts but only runs a few mins at at time. has a marvel shot. carb, just had a rebuild kit installed. new points, condenser, plugs.wires etc. not understanding why wont stay running. please help!

  2. #2
    Join Date
    Jun 2009
    Location
    Hurlburt Field, FL
    Posts
    495

    Default

    Vapor lock maybe?

  3. #3
    Join Date
    Dec 2009
    Location
    Page AZ
    Posts
    159

    Default

    could be a plugged gas line at the tank or coil could overheat and die out. My 300U was 6v and some po converted to 12v battery with the same coil and NO resistor so point life was VERY short. Added a 12v to 6v adapter resistor I had around from the 60's and fixed.When it quits check to see if it still has spark?? if it does remove the drain plug in carb bottom and see if there is gas there. I hope you added a filter in line when you rebuilt the card.
    73 1210 4x4 Travelette 5 spd. 392
    300 utility tractor
    64 Scout 80-152/ weber 32/36
    80 PARTS for 2 scouts
    73 Scout2, 304.4 spd. runs almost rust free!
    Member, Sonora Desert Scouts

  4. #4
    Join Date
    Dec 2009
    Location
    Page AZ
    Posts
    159

    Default

    [QUOTE=lindstromjd;16659]Vapor lock maybe?[/QUOTE]
    NOT on a gravity feed system!
    73 1210 4x4 Travelette 5 spd. 392
    300 utility tractor
    64 Scout 80-152/ weber 32/36
    80 PARTS for 2 scouts
    73 Scout2, 304.4 spd. runs almost rust free!
    Member, Sonora Desert Scouts

  5. #5
    Join Date
    Jun 2009
    Location
    Hurlburt Field, FL
    Posts
    495

    Default

    Just a semi-educated guess. I've seen plenty of guys route their fuel lines too close to exhaust and wonder why the engine only runs when it's cold, then dies as soon as it starts to warm up (because the hot exhaust vaporizes the fuel in the lines before it gets to the carb).

  6. #6
    Join Date
    Sep 2012
    Posts
    4

    Default

    We have a 350 that did that, and it was something plugging the port at the gas tank outlet. Fuel would seep down over time, but when running, it would go a couple minutes, and the engine would starve for fuel and die. 5 minutes later, it would start right back up.

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