Also, while using it you may see Poulan chainsaw won ‘t start when hot, so, wait for a little in between the uses of the chainsaw. This helps prime the circuit, which allows your saw to be started. If you install one that looks the same your saw will not start or if it does will not run right. I have 1950 poulan chainsaw it is missing a primer bulb. This suction brings enough gas into the carburettor and cylinder to start the engine. 1 decade ago. Make sure that you get the tubing that is made for fuel. 99 Some of my 2 cycle power equipment have primer bulbs and some do not. Customer images. How do you think about the answers? I installed the gasket under the mounting plate and the machine started just fine by using the choke. I ordered a new primer bulb, but it won't get here until 3 weeks, and I cut a lawn or two a day. does the carb have a check valve to force the air into the tank. Hipa 4 Pack 12318139130 Primer Bulb for Echo CS400 CS310 CS300 CS301 CS305 CS306 CS340 CS341 CS345 CS346 CS352 CS370 CS3400 CS3450 CS450 Chainsaw PB770H PB770T SRM400U SRM410U Purge Bulb Fuel Line 4.7 out of 5 stars 222. The primer bulb on small engines is a small plastic piece that, when pressed down, draws fuel from the fuel reservoir and into the carburetor. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. dish soap ratio is no problem.? 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. You can sign in to vote the answer. Took the saw to the repair shop and had them replace all the fuel lines and install a new primer bulb, saw still runs great! By creating an account you agree to the Hunker, K & T Parts House: Homelite Chainsaw Service Manual, The Garden Grapevine: Chainsaw Carburetor Repairs. 4. Primer bulbs are used in chain saws to pump fuel from the lower gas tank into the carburetor and then into the engine. Still have questions? 5. Can a water leak increase my electricity bill? It is the major cause of a stalled chainsaw engine. The air in the carburetor is removed and fuel gets in. Lube it a bit with oil and it should slide throgh the hole. Watch videos related to Chainsaw Primer Bulb. Can you run a chainsaw without a primer bulb? A primer bulb … But on the other times, the carburetor bowl remains empty and there is no gas remain in the bowl. Which is better for a home? The primer bulb on my mower has a tear in it, so it won't "suck" gas into the carburetor. Hi, my chainsaw will not start. Lv 7. Special Shipping Information. He holds a Bachelor of Arts in creative writing from the University of Montana. It is present in some models of chainsaws to make the starting process easy. If the fuel lines go through small holes in the case you can cut the ends of the tubing with a razor blade so that it comes to a sharp point. @ As the bulb is released and returns to it’s original shape the outlet valve closes and a vacuum is created. One is the supply, with the filter on the end and the other is the return. You can replace the fuel lines and the primer bulb yourself. Do I need to get one? Make sure that you get the tubing that is made for fuel. It also forces pressure and vacuum. Step 5: Depress The Primer Bulb. Just caught a mouse on a sticky trap. When these diaphragms start to go, they will warp out under the pressure and no longer bring fuel into the carburetor, which could cause the primer button to stop filling. Can you run a chainsaw without a primer bulb? I have an old Craftsman chainsaw that runs great, once you finally get it running; it takes a long time to get the fuel in the carb and finally get it started. 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. how much (certain concentration of ) bleach  to water for moss kill on corregated  concrete roof ? Without this button, the carburetor couldn't draw up enough fuel for the crankcase to get moving fast enough to fire off the necessary spark. I have 1950 poulan chainsaw it is missing a primer bulb. Answer Save. All the fuel lines fell apart, including the bulb from sitting. Without going into details the primer bulb forces fuel to the carb jets and not the engine directly. Try to start the chainsaw. In this case, one more fuel line will need to run from the bulb to the metering inlet on the carburetor. When the bulb is depressed the outlet check valve is forced open and the air and fuel in the bulb passes through the outlet check valve and into the. His articles have appeared in "Outside Missoula, Outside Bozeman," "Hello Chengdu" and online at GoNomad.com and various other websites. Carburetor diaphragms should be replaced by a professional. Right now it starts, but it dies as soon as you start cutting the grass. renpen. URGENT! I didn't want to drive 10 miles to buy a primer bulb for a Homelite sx 125 2 cycle string trimmer so I used the outside of the bulb mounting plate as a pattern to cut a gasket. All the fuel lines and the other times, the carburetor line on most chainsaws on... Bulb are an inlet and an outlet saw still only runs a few seconds then.! Brings enough gas into the carburetor tank and into the carburetor to get the gas is not getting the... Hoses ' connections with the carburetor Minneapolis, Minn., Eric Blankenburg has been a freelance journalist since 2000 improve... Removes the excess air from the University of Montana try to start the chainsaw priming... 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