Just bought a used McCulloch Chainsaw on the cheap knowing that the fuel system needed work. The saw starts and runs really nicely initially, running obviously on the primer fuel. There was four total rubber lines in the saw, one obvious one going from the bar oil to the oiler system, two going into the fuel tank and one going from the bulb to the carb.
If there is too much fuel mixed with the air, the engine “Runs rich” and either will not run, runs with a lot of smoke, runs poorly or, at the very least, wastes fuel. There is an adjustable plate across the tube called the throttle plate, which controls how much air can flow through the tube. One of these screws controls how much fuel flows into the venturi at full throttle.
I replaced the fuel line and filter and can now see that no fuel comes up the line to the carb. More than likely the carb needs rebuilt but if somehow the impulse hole gets blocked by a gasket shifting or improperely installed it won’t work at all. I would venture a guess that 90 percent of the chainsaws ,weed wackers ,blowers and other two cycle engines I work on the problem can be traced to a faulty carb from deteriated parts.
does a chainsaw have a fuel pump Related Question:
Do Stihl chainsaws have a fuel pump?
Convenience at the touch of a button A manual fuel pump makes it easier to start STIHL chain saws and power tools and reduces the number of pulls required. Simply press the primer bulb several times before starting.
What would cause a chainsaw to not get gas?
If your chain saw isn’t getting gas, the trouble most likely lies in one of those three core components: the fuel tank, the spark plug or the carburetor, or one of the minor parts adjacent to the three.
Does a 2-stroke have a fuel pump?
In a two-stroke engine the pulse tube of the fuel pump is connected to the engine crankcase. As the piston ascends and descends the pressure in the engine crankcase transitions between positive and negative.
Does a carburetor have a fuel pump?
The carburetor typically contains a float bowl into which the expelled fuel is pumped. When the fuel level in the float bowl exceeds a certain level, the inlet valve to the carburetor will close, preventing the fuel pump from pumping more fuel into the carburetor.
Does a chainsaw have a carburetor?
The carburetor on a chain saw is pretty simple, as carbs go, but it’s not entirely uncomplicated. The job of the carb is to accurately meter extremely tiny quantities of fuel and mix it with the air entering the engine so that the engine runs properly.
Why is my chainsaw building pressure in gas tank?
If the saw is working hard the fuel will heat up and, along with the vibrations it will vaporise, causing the pressure build up. It has been mild today, but if you are using fresh fuel it will be winter grade and therefore vaporise much too readily. Even more so if it’s a high ethanol content fuel from a supermarket.
How much does it cost to service a Stihl chainsaw?
Service Description. General service is $49.50 labor plus parts (Air filter, fuel filter, spark plug, chain etc)
How do you start a stubborn chainsaw?
Try to start the chainsaw after priming the carburetor. 5. Activate the choke by moving the lever to the full choke position and pull the starter rope 3 or 4 times to start the engine. If that doesn’t work, move the choke lever to half choke and pull the starter rope, 6 times maximum, to start the engine.
How does a 2 stroke carburetor work?
The process is actually quite simple. When the throttle plate opens, air flows into the carburetor. The venturi creates the vacuum needed to draw in the air and a small amount of gasoline (a “mist”) which then mixes with the air which is then drawn further into the combustion chamber of the engine.
How much is it for a fuel pump?
The average cost for a fuel pump replacement is between $220 and $1,062, depending on vehicle and age. Labor costs are estimated between $124 and $260, while parts are priced between $95 and $854. Estimates do not include taxes and fees.
On which fuel does the pump run?
Located in the fuel tank, your fuel pump moves gas from the gasoline tank to the engine. The pump creates the pressure needed to move gas from the fuel lines to the engine.
Where is the tank vent on a Stihl chainsaw?
Locate the tank vent on the fuel tank’s nipple, just to the left of the rear handle, and beside the starter cover.
Are chainsaw gas caps vented?
The gas cap on a Poulan chainsaw covers the tank and keeps gas from spilling while you cut. It is also designed to vent excess heated gases to keep the right amount of pressure, which allows the fuel to be pumped into the carburetor via the fuel line.
What does a chainsaw service include?
Chainsaw Servicing comprises Brigss and Stratton engines are the most commonly found petrol engines on todays garden machinery, and we cater for the service and repair of engines, as well as the supply of service items such as spark plugs, air filters, fuel filters and oil filters.
How much should it cost to tune up a chainsaw?
THE AVERAGE CHAINSAW SERVICE IS $100 TO $125 If we can find ways to help save you money, we will suggest them to you. If we do not feel it is worth repairing, we will tell you so.