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After priming lawnmower starts it runs for a few seconds and then stops

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  • dbabina Jun 05, 2010

    yese i get a continous flow of gas but now the throttle idles roughly

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You need to make sure that if it has a filter between the tank and carb that fuel is getting through it. Also make sure there isn't any junk inside the tank.
If the carb has a fuel bowl, usually the bottom nut that holds it on has two tiny orfices near the bottom that allow fuel to flow through If they become blocked they are nearly impossible to see but they can be cleared using a straight pin and some carb cleaner. The nut is not only a nut but also serves as a fuel metering device. Depending on how the mower was stored, the carb can also internally corrode. sometimes it can be cleaned out, sometimes they need to be replaced (last resort though).
In running with a prime, it's telling you it has a fuel delivery problem.

Posted on May 31, 2010

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Posted on Jan 02, 2017

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01fordeb
  • 1033 Answers

SOURCE: I can start my 4.75 HP Briggs & Stratton

Try replacing the float and needle. The float (floats) and pulls the needle up to let gas through to the carb. It will stay running as long as you press the prime bulb because this sends gas straight to the carb without going through the gas bowl. It's best to remove the carb and clean it then replace the float and needle

Posted on Sep 05, 2010

daneinwv
  • 124 Answers

SOURCE: mower starts after prime,runs for a few seconds

Hello,

My name is Dane and I am going to try to help you solve your problem. I believe that you have clogged jets/passages inside of your carburetor. This can happen when an engine gets little use, allowing the fuel in the system to get old and begin breaking down. If fuel is left in a carburetor for more than a year, it can eventually turn into a jelly like consistency, and clog the fuel system.

The other way to block these passages is to allow dirt or other debris to enter the fuel tank. This will be picked up through the fuel line, also clogging the system. The easiest way to determine if you have a clogged fuel system is to remove the air cleaner/filter, and spray a little starting fluid directly into the carburetor opening, and crank the engine. Do not use a large amount of starting fluid. If it starts for a couple of seconds and then quits, you've found your problem. A clogged carburetor. If not, you have another problem. Using too much can harm your engine.

You will probably need to remove, disassemble, soak, and use compressed air to blow out the jets in your carburetor. Pay close attention to how the carburetor is attached to the engine. Make a drawing if you need to or take some pictures. Remove the carburetor from the engine. You will need to disassemble the carburetor as far as possible and put it in some Carburetor cleaning solution. You can get this at any auto parts store. Do not place rubber parts in the solution. Allow it to soak in cleaner as directed, and then blow out the ports and jets with compressed air before you assemble and reinstall it.I hope I've helped. If you found this information useful, please leave feedback as deserved. Thank you! Dane

Posted on Dec 06, 2010

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Will start but will only stay running if you prim it until its warm then runs fine


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1 Answer

My craftsman gasoline lawnmower will start when primed run less than a minute then cut out . how do I determine the problem...then fix it


Have you checked the fuel supply first. Its possible your jet valve may be plugged or dirt in the fuel bowl. One quick way of checking this is take the spark plug out and put a little shot of gas in the spark plug hole then reinstall the spark plug and put wire back in place and try to start engine. If it start and revs up for a few seconds till the gas is burnt up then stalls it is pretty certain its a dirty fuel jet or dirt in the fuel bowl. This quite often a real cheap fix .

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Why wontsmart carb engine start if primed runs for few seconds


dirt or water in the carby jets
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1 Answer

Lawnmower starts when primed only then stops


All mowers have a low oil cutoff. Fill oil. 30w.

May 29, 2013 | Garden

1 Answer

Sears lawnmower kills after mowing for 10 minutes doesn't restart till rested a long time. Repair man says nothing wrong with it.


That is the symptom of a failing ignition module. With the airbox cover and air filter removed run the unit till it fails. Immediately squirt a shot of carb cleaner into the carb and try to restart. If it restarts see if you can keep it running on the carb cleaner for a few seconds. If it wont restart or stay running then its likely an ignition module. If it does restart and keeps running on hte prime then you have a fuel issue.
Other things to check: spark plugs can fail when they get hot, checkt o make sure the engine stop cable is pulling the bail off ground sufficiently. If the cable has stretched it may not pull the bail completely off ground causing intermitent spark.

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1 Answer

I have a new 650 sears craftsman self propelled 22" lawnmower that will not start. I have gone through the prime bulb instructions, still no luck.\r\nAny ideas? Walter in Alberta Canada.


could be the priming bulb gasket between the air-filter assy. and the carb.
I have the same lawnmower and if I prime with gas from a can it will start but stop after a few seconds. When I push the bulb I can hear air leaking in this area. You can replace the gasket by removing the back half of the air-filter assembly. I am looking to buy a gasket today I let you know how it works out! Thanks Ron

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1 Answer

I can start my 4.75 HP Briggs & Stratton Lawnmower but it dies after a few minutes. I replaced the armature but the same thing happens. I can keep it running if I press the prime bulb a couple of times...


Try replacing the float and needle. The float (floats) and pulls the needle up to let gas through to the carb. It will stay running as long as you press the prime bulb because this sends gas straight to the carb without going through the gas bowl. It's best to remove the carb and clean it then replace the float and needle

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2 Answers

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