gas through fuel lines?

Discussion in 'General Questions' started by masterx1234, Jun 7, 2010.

  1. masterx1234

    masterx1234 Member

    im having an issue with my gas tank, its pulling gas through the lines by itself and without it being attached to the motor!, last night i filled the tank up and in the morning all of it was in the motor and dripping out the ports on the carburetor! whats going on here? is it supposed to do this because it floods the motor like crazy

  2. nidyanazo

    nidyanazo Member

    So you're saying the gas tank is mounted on the frame and full of gas.
    It has a fuel line attached to the petcock valve, but not to the carb.

    If this is the case and it's dripping gas, it's a faulty/leaking petcock valve, or the threads were not sealed and it's leaking from where the valve attaches to the tank.
    Can you clarify?
  3. professor

    professor Active Member

    Could be the float valve is leaking.
    It is a good idea to have a shut-off at the tank and use it for any build or small engine.
  4. masterx1234

    masterx1234 Member

    Attached Files:

  5. motorpsycho

    motorpsycho Active Member

    it sounds like you have the gas line hooked to the carb. if that is the case, it sounds like your in-line shut off valve is either not closed all the way or is leaking internally. (you do have a shut off valve on the fuel line right?)
    it could also be that your float in the carb is stuck down. remember, these are gravity feed, and if the float is stuck down, the needle & seat in the carb will always be open causing gravity to constantly drip gas into the carb. eventually, gas will come out of the carbs. overflow tube, or the back of the carb...whichever path it can find to over flow. if your float level is set right, and you leave the shut off valve open, gas can still overflow slightly as the air temp. changes, gasoline expands and contracts with the temp.
    when the float bowl gets full and the needle & seat doesn't close to shut off the fuel supply it will just keep dripping until your tank is empty. you should install an in-line shut off valve in the fuel line if you do not have one.
    i suspect that this is the problem.
    Last edited: Jun 8, 2010