A cure is usually like this- Drill 2 or 3 1/2″ holes from the fan area to the carb box so cool air can blow in around the carb from the fan. Then drill 3 or 4 1/2″ holes at the back of the carb cover,above and behind the carb. Thus you have cool air blowing from the fan thru the carb box and out the back keeping the carb cool and hot air building up around the carb.
It would be rare to have an MS 440 vapor lock while running since the saw’s fuel tank and carburetor are well isolated from the heat of the engine and fuel that is flowing does not have as great a chance of getting hot enough to turn it into vapor. Vapor lock will usually manifest itself after shutting the saw off and then trying to start the engine within a few minutes after the fuel has been sitting in the carb and has had a chance for the radiating engine heat to raise the temperature of the fuel system components to a point where the fuel can vaporize. I asked my dealer today and he said that it didn’t vapor lock, he did some adjusting to it and said that it could be the fuel filter sticking in the gas tank somewhere, up out of the fuel to make it run like it was out of gas like I described.
Usually a tank vent problem will cause a vacuum as the fuel is pulled out. If you have recently changed the fuel lines, and the fuel line is laying too near the engine, it could also cause a vapor lock. Removing the fuel cap for a minute will release the lock.
The Dolmar PS-6100 is a rather modern saw with reed valves which might help prevent vapor lock. Vapor lock on my PS-7900 doesn’t require 15 minutes, nor does my PS-7900 have to be sitting in the sun!Scenario:- run her hard, bucking cut after bucking cut continuously for up to a tank of fuel. EDIT:I think vapor lock is a carb issue, gas vapors building up or entering the carb prevent the diaphragm to pump fuel.
Rapid Lesson Sharing Event Type: Chainsaw Vapor Lock Accident Date: July 1, 2013 Location: Aragon Fire, Cuba Ranger District, Santa Fe National Forest Narrative A sawyer was injured when gas from a Stihl MS460 chainsaw fuel tank ignited after the sawyer opened the fuel cap to release excess pressure in the tank. Sawyers should therefore always move away from any potential ignition sources prior to releasing the excess pressure in the fuel tank. Vapor lock occurs when the fuel within the fuel delivery system overheats and vaporizes too rapidly.
how to fix vapor lock chainsaw Related Question:
What causes vapor lock in chainsaws?
Vapor lock occurs when the fuel (usually gasoline) within the fuel delivery system overheats and vaporizes too rapidly. The resulting excess gas bubbles accumulate to the point of actually blocking normal fuel delivery.
How do you clear a vapor lock?
Once the fuel system has cooled, you can help eliminate any vapor left in the fuel system by first pressing the accelerator pedal slightly (do not press it to the floor) while cranking the engine. Once the engine starts, hold the accelerator pedal down until the vehicle runs smoothly, indicating the vapor lock is gone.
How do I stop my carburetor from vapor locking?
If you’re wondering how to prevent vapor lock, try using a thermal barrier like a heat shield, or heat sleeve. Whether you have a carburetor or use fuel-injection in your vehicle, vapor lock can bring your vehicle to a standstill causing hours of frustration.
What can you do about vapor lock?
There are several ways to solve vapor lock problems, including installing an electric fuel pump or adding a plastic carb spacer. At Prestige Motorsports, our favorite method is to install an Aeromotive in-tank fuel pump and return system.
Why does my chainsaw cut out when hot?
When your chainsaw quits after it gets hot, you either have a problem with gas flow being restricted into the engine or with the spark. This is a common occurrence on older-model chainsaws. By replacing your spark plugs and keeping your gas lines clear you can reduce the chances of this problem recurring.
What causes an engine to vapor lock?
Vapor lock is a problem caused by liquid fuel changing state to gas while still in the fuel delivery system of gasoline-fueled internal combustion engines.
What temperature does vapor lock?
When modern injection motors are stopped after long travelling, some might not be able to restart immediately. The reason is that those new motors reach temperatures up to 120-140°C, and vapor lock is prone to happen at high temperatures.
Is there a fuel additive to prevent vapor lock?
The following are some practical tips for preventing vapor lock. ALWAYS USE FRESH FUEL WITH FUEL STABILIZER. Gasoline can go stale in as little as 30 days. Fuel stabilizer additives are available at most automotive supply stores.
Can vapor lock cause overheating?
Vapor lock can be for any pipe wehere the flow is stopped due to a pocket of air. Poor bleeding or burping of the cooling system can cause overheating so it is something that has to be done correctly.
Does higher octane gas prevent vapor lock?
Octane ratings are an indication of the burn or flash rate of fuel. The higher the octane rating the lower the volatiles and the slower it burns. Now it makes sense to me, high octane fuel has fewer volatiles to slow the burn rate and fewer volatiles means less vapor lock.
Can vapor lock happen in fuel injection?
Vapor lock can occur in fuel injected vehicles. The occurrence is rare, however. The vapor lock risk is also reduced by E85, Ethanol, and Methanol. To prevent vapor lock, it is important to rout fuel lines away from exhaust parts, heater hoses, etc.
What flavor is vapor lock black?
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Will Heet unfreeze fuel line?
Bell Performance offers a selection of effective cold weather treatments, including Quick Thaw treatment for diesel and gasoline. HEET is another additive recommended. Whichever you choose, you need to buy it before you have a cold weather problem.
How do you tell when a chainsaw chain is worn out?
The chainsaw pulls in one direction, which results in a crooked finish. Blunt cutting teeth on one side or uneven teeth lengths usually cause this. The teeth has hit rocks or dirt and broken. If you notice the tops of the teeth are missing you will need to replace the chain.
What happens when a chainsaw overheats?
The air filter will eventually get to a point where it will become so clogged that it won’t let fresh air pass through. At this point, the engine will stop working because it cannot run without air. This will make the chainsaw overheat due to the lack of cooling fresh air.