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New primer bulb but engine won't prime

Troy Bilt mower will start cold only if I spray gasoline or starter fluid into the carburetor. Once it starts, it runs fine and will restart OK. I put a new primer bulb on it but it doesn't help. What else could be wrong with it?

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  • Garden Master
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Remove and clean the carby. clean out the main jet. ensure that there is nothing stopping the primer circuit from working. There are two valves under the primer bulb and a spring. when you push in the bulb fuel is squirted into the manifold When you take your finger off the bulb the spring pushes it out and new fuel is drawn past a valve to fill under the bulb. Pushing in again closes that valve and opens a second valve which allows the fuel into the manifold again

Posted on Apr 26, 2013

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highspeedsan
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Check the kill switch. It may be stuck in the off position.

Posted on Apr 26, 2009

#1 Taper
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SOURCE: troy bilt mower won't stay running to cut lawn

You may want to check the gas cap to see if it clogged with dirt. If the gas cap is clear, you more than likely have a carburetor problem. If you need tips on carb. cleaning, feel free to ask.

Jim

Posted on May 30, 2009

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Check the muffler, if the muffler is clogged it could cause overheating of the engine, and could keep the engine from getting the necessary fuel-gas mixture.

Posted on Aug 12, 2009

digritz
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SOURCE: troy bilt lawnmower not starting

In most cases it's not enough to just dump the gas out of the float bowl. The problem is that the gas has turned to varnish and varnish is sticky. It will put a nice coating over all the the interior of the carb. The only way to clean it is to dismantle it completely. This means removing the float bowl and float. Along with the needle.The important thing is that both the float and needle move freely and both the high and low idle screws are clean. Depending on the type of fuel filter you may also need to remove and clean it as well. If it is not an inline filter it most likely is located inside the tank. As long as your careful not to tear the float bowl gasket you shouldn't require a rebuild kit for the carb.
Hope this helps.

Posted on Sep 16, 2009

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SOURCE: My lawnmower won't start

my lawn mower has a new battery but will not start

Posted on Nov 02, 2009

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2 Answers

Primer bulb not pumping fuel into carb, pull it out, no splits etc. Once I get fuel in it starts and runs fine??


Probably a valve in the priming system is stuck. It allows fuel to flow into the bulb from the tank, the valve should close then and allow the bulb pressure to spray into the carburetor. Could also be the opening into the carburetor from the prime bulb is blocked.

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1 Answer

Hi, I have a Craftsman lawnmower, sel propelled, over 10 years old. It doesn't seem to start unless I spray gasoline into the carburetor. Also, it will only keep runnning if I continue to spray into...


the Primer bulb most likely has a crack in it. If it does then there won't be sufficient suction to draw in the fuel. Also, if you remove the carburetor, separate the upper and lower halves so you can get to the fuel bowl, check that the float needle isn't sticking inside the hole. Look for dirt and other contaminates.
Do you by chance have the model # of the mower? It will be in the following format: XXX.XXXXXXX The model # sticker is usually located on the deck behind the engine. And what HP is the Engine? (It should be a Briggs and Stratton.

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We have a troy bilt snow blower 1 yr old and we are trying to start it. When we try to prime it, the primer bulb does not seem to be moving any fuel. It just sounds like air. It will not start. We have...


Are there two tubes connected to the back of the primer bulb?
If it is connected, then the primer bulb itself could be cracked, allowing air to enter, but not fuel.
See if you can gently pry or possibly unscrew the bulb for replacement. They are readily available.
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