I have a chraftsman 42cc 18 inch chainsaw, I know it’s a throw away! I also own many stihl chainsaws aswell. Tore the saw apart put new fuel lines and a carb on it, I tuned it and it runs great for a while then fuel leans out and starves the carb I notice it will idle down and not bog WOT when I pull the fuel cap off. So I was thinking, I have left over fuel vents from other stihl builds.
In order to maintain the functionality and integrity of the fuel cap and its venting, you will need to clean the cap from time to time. Right underneath the gas cap, there is a rubber gasket that is designed to create an airtight seal between the gas cap and the base of the fuel filler neck. Stopping after the clicking noise not only ensures that the cap has secured properly, it also gives you a natural stopping point when tightening the gas cap on your lawnmower.
I think the saw is an ’04 and I am trying to find the gas tank vent. I just got the saw and the few times I have run it, it has been hard starting, but once started it runs and idles and once run starts easily. As the day was ending I was cutting a few stumps down to ground level when it started to struggle to stay running and evidently quit and I could never get it to restart.
how to clean chainsaw gas cap vent Related Question:
How do you clean a vented gas cap?
The fuel cap (a.k.a. gas cap) on lawn mowers, chainsaws and other gasoline-powered outdoor power equipment is a magnet for dust, dirt, grass and other debris. Many people use a dry rag to remove the “crud” but I’ve found that the most efficient way is to use a paint brush.
Does a chainsaw gas cap have a vent?
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.
Why are gas caps vented?
The vented gas cap is designed to vent small amounts of air into the car gas tank line. The vented gas cap has a one-way release valve that is pressure-activated. When the pressure reaches a certain point (defined by so many pounds per square inch) the valve opens by a very small amount, relieving some of the pressure.
Why is my gas cap stuck?
In many circumstances, the problem that causes a gas cap to be stuck is caused by one of three things: A mechanical defect in the gas cap. User error on installing the gas cap. A mechanical defect in the gas tank filler neck.
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.
Where is the fuel 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.
How does a fuel tank vent work?
Your tank has to breathe. In order to breathe, your tank must have a vent somewhere that will relieve both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down.
What happens if fuel tank vent is clogged?
You will have poor performance, stalling, a hard time staring but will likely experience difficulty filling up your tank, or your car will either stall completely or won’t start at all. Read on to understand how to deal with a clogged fuel tank vent and distinguish it from a clogged fuel filter.
What will be the effect of clogged fuel tank vent hole?
Should the venting system become blocked, the fuel pump will eventually suck all the air out of the fuel tank and won’t be able to pump fuel anymore; so the vehicle wii die and not restart.
How do you open a stuck gas cap?
If the plunger does not snap into locking position, this component is damaged and needs to be replaced. If the plunger does snap locked, have your assistant press the door unlocking button in the vehicle. If the plunger pops out, the issue might be with the door itself or where the plunger connects to the fuel door.
What does an impulse hose do?
The impulse line connects the carburetor with the crankcase which is attached to the engine. The main purpose of this line is to create pressure. Then this pressure creates a vacuum inside the carburetor. After that, the attached fuel will start pulling fuel from the fuel tank.
How do you vent a gas tank?
A typical vent line will run sideways across the top of the tank until it reaches the hull side and then angle upward to the vent fitting. The hose should run as straight as possible at this point in a manner that allows any fuel to drain back into the tank via gravity.
How do you adjust a Stihl 026 carburetor?
Start the saw and run it to warm it up with the bar and chain on it. With a tach, set the idle to 3300 RPM. Then turn the L screw in or out to get the highest idle speed. Reset the L/A to 3300 RPM again, and redo the process until you get the highest idle from the L screw.