How it works:
- Primer bulb is pressed and released
- When released a vacuum is created and fresh fuel is drawn into the intake fuel line
- The intake fuel line deposits fuel into the carburetor making it ready or “primed” for combustion
What is a primer bulb on a chainsaw?
Some chainsaws use a primer bulb to help suck gas into a cold carburetor. When the gas leaves the fuel tank it enters a plastic hose that connects the tank with the carburetor. Another fuel hose brings any unused fuel back into the tank. The primer bulb sits in the middle of this return line on most chainsaws.
How does a primer bulb work?
How it works: 1 Primer bulb is pressed and released 2 When released a vacuum is created and fresh fuel is drawn into the intake fuel line 3 The intake fuel line deposits fuel into the carburetor making it ready or “primed” for combustion More ...
What is a primer bulb on a carburetor?
A primer bulb is important because it is helps to fill the carburetor with the correct amount of fuel. It does this by pulling fuel through the fuel line. You may need to fix or replace your primer bulb if: It is not creating proper suction.
Why is my primer bulb not working?
When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. The same goes for fuel lines. When they've hardened and cracked, they let in air, which makes it impossible to draw the fuel into the carburetor properly. Also Know, why do primer bulbs stick?
How do I know if my primer bulb is working?
0:171:49Hard to Start? HOW TO TEST the PRIMER BULB on a ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd you can tell if the primer bulb is working. It's a 5/16 you can also use a flathead screwdriverMoreAnd you can tell if the primer bulb is working. It's a 5/16 you can also use a flathead screwdriver to take this.
How does the fuel primer work on a chainsaw?
Some chainsaws use a primer bulb to help suck gas into a cold carburetor. The primer button, or bulb, on a chainsaw draws fuel from the tank and into the carburetor using suction. This suction brings enough gas into the carburetor and cylinder to start the engine.
What causes primer bulb not to prime?
When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. Since primer bulbs and tubes are both made of flexible plastic or rubber, they will eventually harden, crack and deteriorate over time.
How does a fuel priming bulb work?
How it works:Primer bulb is pressed and released.When released a vacuum is created and fresh fuel is drawn into the intake fuel line.The intake fuel line deposits fuel into the carburetor making it ready or “primed” for combustion.
Can you bypass a primer bulb?
There should be a thin springy washer around the rubber bulb, that holds it in. Pry out, pull out bulb-insert new one, slip springy washer down over primer bulb, to keep it in place.
Do primer bulbs have a check valve?
RE: Fuel primer bulb bulbs have a check valve built in them.
Which fuel line goes to the primer bulb?
The (clear) fuel intake line runs from the top of the carburetor (straight nipple) and goes to the short post on the back of the primer bulb. The return line (blue) comes from the long post on the back of the primer bulb and goes into the bottom of the fuel tank.
How do you prime a new primer bulb?
0:001:48Primer Bulb won't prime or fill with gas, how to fix. (purge bulb)YouTubeStart of suggested clipEnd of suggested clipDown half an inch or an inch or. So you know so not down in the fuel.MoreDown half an inch or an inch or. So you know so not down in the fuel.
How do you fix a primer bulb?
3:585:26How to Replace a Primer Bulb - YouTubeYouTubeStart of suggested clipEnd of suggested clipJust like that now the primer bulb is held in place by a couple of small tabs I find the easiest wayMoreJust like that now the primer bulb is held in place by a couple of small tabs I find the easiest way to remove it is to just use a pair of needle nose pliers and kind of press the tabs.
How many times should I press the primer bulb?
1:409:53Purge Primer Bulb - Pressed too Many Times! - This will Happen - YouTubeYouTubeStart of suggested clipEnd of suggested clipThree sometimes four sometimes five depending. On what the manufacturer specifies for that machine.MoreThree sometimes four sometimes five depending. On what the manufacturer specifies for that machine.
Why does my primer bulb collapse?
A bulb may collapse simply because it's old and worn out. Bulbs are made from rubber or flexible plastic that can become soft after repeated use, especially if you use fuel with a high ethanol content.
Is primer bulb necessary?
A primer bulb is important because it is helps to fill the carburetor with the correct amount of fuel. It does this by pulling fuel through the fuel line. You may need to fix or replace your primer bulb if: It is not creating proper suction.
Fixing the primer bulb
There are three steps to the process. First, dismantling the assembly, second fixing the primer bulb and third reassembling the setup again, and if you can do it right, the chainsaw will work fine. Here is the know-how.
Dismantling
Make the tank dry and check there is no fuel inside and unscrew the top cover of the chainsaw. This will help you take out the saw from the body. Unscrew the side and get off the starter assembly. Next, take off the air filter socket and the air filter.
Taking out the primer bulb
The primer bulb has to be removed from the carburettor. Putting a screwdriver in the holder of the primer bulb and pressing it will make the bulb come out. Then, with a plier with elongated tongs, the fuel lines must be taken out from the primer bulb. There will be two fuel lines.
Fixing the primer bulb
Detect the intake and the return ports of the primer bulb. Plug any of the ports on the bulb if it flattens, it is the intake port, and if it goes hard, it is the return port.
Reassembling the Chainsaw
Follow the reverse steps you have dismantled. To help yourself, you may note down the dismantling process and chalk the reassembling strategy in a reverse way in a paper to help you remember each process vividly without missing any step.
Conclusion
Making a temporary fix with the replacement of the primer bulb on a chainsaw is easier. Most of the time, it saves the hassles of taking it for repair and saves you dollars. Above that is the satisfaction that you have repaired it of your own.
How does a primer bulb work?
How does the primer bulb work? How It Works. Pressing the primer bulb creates a vacuum that sucks gas from the fuel tank through the fuel lines and into the carburetor. Pressing the primer only a couple times should supply enough fuel to mix with air in the carburetor, and be ready for combustion. Just so, why does my primer bulb not work?
Why is a primer bulb important?
A primer bulb is important because it is helps to fill the carburetor with the correct amount of fuel. It does this by pulling fuel through the fuel line. You may need to fix or replace your primer bulb if: It is not creating proper suction. Similar Asks.
Why isn't my primer working?
Just so, why does my primer bulb not work? When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. The same goes for fuel lines. When they've hardened and cracked, they let in air, which makes it impossible to draw the fuel into ...
Do primer bulbs stay hard?
Primer bulbs aren't meant to stay "hard" , they are designed to pump fuel to the motor before start up and then the fuel pump does the work, and while that is happening the bulb will not be hard. Is primer bulb necessary?
Bad Gas Lines
When the gas exits the fuel tank, it enters a plastic line that connects the tank to the carburetor, which is then connected to the engine. Another fuel hose is utilized to re-fill the tank with any remaining fuel. This return line on most chainsaws is divided by the priming bulb, which is located in the middle.
Faulty Primer Bulb
Another possibility for the filling problem with the primer is a fault with the bulb itself. It is possible that small perforations in the rubber will let enough air into the fuel system to cause the suction to become too feeble. To check for small holes or puncture marks on the bulb, carefully remove it from the engine and inspect it thoroughly.
Poor Hookups
The fuel hoses are connected to the carburetor through two elbow connector joints. A variety of accidents can cause these hoses to become dislodged from their mountings. They can also come loose over time due to thermal expansion and contraction of the hose. This allows air to leak into the system, resulting in a weak suction and a reduced suction.
Problems in Carburetor
The carburetor in most chainsaws will make use of a set of diaphragms to assist in pulling fuel into the carburetor, mixing and measuring it, and then sending it to the engine’s cylinder. The repeated heating and cooling of these diaphragms will cause them to gradually wear out.
Why do chainsaws use primer bulbs?
Some chainsaws use a primer bulb to help suck gas into a cold carburetor. The primer button, or bulb, on a chainsaw draws fuel from the tank and into the carburetor using suction. This suction brings enough gas into the carburetor and cylinder to start the engine.
How does a chainsaw carburetor work?
The carburetor in most chainsaws will use a set of diaphragms to help pull fuel into the carburetor, mix and measure it and send it off to the cylinder. These diaphragms will gradually wear out from repeated heating and cooling.
Why isn't my primer button filling?
Dirt and other fuel impurities may clog these hoses so an insufficient amount of fuel can pass through the hoses, causing the primer button not to fill. Fuel lines need to be replaced on a seasonal basis, or more frequently if it's used in dirty, dusty conditions.
Why is my primer filling so bad?
Small perforations on the rubber could inject enough air into the fuel system to make the suction too weak. Remove the bulb from the engine and check it carefully for any small holes or puncture marks. Replace any worn or cracked bulbs. Check the points on the underside of the bulb as well. These two holes can also get clogged or be blocked by dirt in the fuel.
How do fuel hoses work on carburetors?
The fuel hoses connect to two elbow connector joints on the carburetor. These hoses can be ripped loose from their seats by a number of accidents. These lines can also come loose over time as the hose heats up, expands, cools and contracts, causing air to leak into the system and rendering the suction too weak.
