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Re: After it starts its over heating cause vapor lock?
You do not need to press the primer if the machine has been running, over heating is another issue, the boiling sound could be the gas just super evaporating when it hits that hot cylinder, if its getting that hot there is some other issue. Maybe your fuel mixture is to rich, check to see that your fuel to oil ratio is correct.
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Sounds like to needle valve is sticking allowing extra fuel to continuously flood the carb. One easy quick fix is to add a product called Sea-foam to your gas tank and allow it to dissolve any gum deposits that have been deposited in your carb. Keep in mind that Ethanol gas will start to go bad in 30 days if you do not add a stabilizer (such as Sta-Bol Ethanol or similar). Best to never leave gas (stabilized or not) in your gas tank for more than 90 days.
IF it was vapor locked it would still turn over just not start. If it was vapor locked you can just loosen the gas cap and it would immediately start. If it is vapor locked you will hear a hissing suction sound while loosing gas cap. Its trying to get air.Quick fix leave gas cap off..Drill a small hole in the center of gas cap. It will let it breath. To fix it right.Buy the filtering charcoal canister. Never put that extra 25 cents in at gas station once gas nozzle clicks. That extra gas goes down the vapor filtering line causing it to clogg up over years.
Primer bulbs pull fuel from the carb, into the bulb and dumps it back to the tank, if you have re connected the hoses to the primer the wrong way around it will try to force fuel into the carb and make it flood.
sounds like you hooked the lines up backwards, when you press the primer it is supposed to squirt gas into the tank on the return line cause what it does is draw fuel through the carb and back to the tank....filter line from tank goes to fuel pump side of carb and return line on carb goes to primer bulb then opposite line on bulb to tank...... so when you press bulb it draws fuel through filter in tank through carb and back to tank ! good luck! 2StrokeJim
The tank vent is a bronze plug inserted into the tank casting--the caps are not intended to vent. Check the fuel filter for plugging and the condition of the fuel lines and primer bulb. You should be able to fill the bulb with fuel after several pushes of the primer bulb. Have the fuel lines been changed? Hope this helps!
Follow the instructions exactly. If it won't start, take out the spark plug to see if it is wet, or dry. If it is too wet, the motor may be flooded. If it is completely dry, you have to figure out why it's not getting gas. I am assuming you are pressing the bulb the recommended number of times, and that there is gasoline in the bulb, providing some resistance to your pushes with your thumb.
You cannot flood the engine by pushing the primer bulb too much, unless the hoses are hooked up backwards. The primer does not push gas to the carb, it sucks gas through the carb and returns it to the tank. Top barb on primer is the hose coming from the return side of the carb and the bottom fitting is the hose going to the return fitting on the tank. Look inside tank, it is the one without the filter on it, just a flange with a hole in the center.
If you can see gas and air bubbles moving through the primer and into the tank the hoses are on correctly. If you see bubbles going in the correct direction and then reversing when you remove your finger from the bulb, then the check valves in the primer may be bad. Replace primer.
When you say the primer "gets hard to mash", do you mean it is hard to push in or is it very slow to refill and return to the home position? If it is hard to push in and the bulb is full of gas and the hoses are on correctly then there must be a plug in the line going to the tank or the vent in the gas cap is not working. If it does not return, then it is most likely a plugged filter, plugged line from the tank to the carb, plugged screen inside the carb or a stuck needle valve. The primer is creating a slight vacuum to pull the gas through the carb, which is what the carb does when the engine is running. If there is a full or partial restiction on the supply circuit neither the primer nor the carb can pull enough gas for the engine to run. May need to disassemble carb and clean out any varnish, gunk or plugged ports/jets. Use spray carb cleaner. May want to think about a diaphagm and gasket kit if you do it yourself. If you do not feel confident in taking apart the carb, then take to a repair shop.