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I have a craftsman eager-1 4.5 hp mowerthat won't stay running. If I hold the primer bulb in, it runs. I've adjusted the screw all the in and it still won't keep running. Any ideas?

Model 917.388040

Posted by Eugene Marshall on

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MetalHead

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Do you hold the primer in or pump it? Pumping the primer forces the fuel into the intake bypassing the diaphragm's intended function. Assuming you pump the primer to keep it running your carburetor is dirty and should be cleaned. Ensure that your fuel is fresh and that your fuel can and fuel tank has no water in it. Ethanol in fuel will evaporate and cause condensation thus creating unwanted water.

Posted on Apr 20, 2012

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5 Related Answers

hunter19_46m

Curtis Sewell

  • 7482 Answers

SOURCE: mower starts but won't stay running unless you

Hi
Sounds like you have dirt/debris in your caburetor jets,fuel passages.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
Make sure you are using fresh fuel.
If the moweris over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor rebuilt that should solve your problem.
Please take time to rate me

Posted on Aug 05, 2011

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Jeff Howe

  • 84 Answers

SOURCE: craftsman eager-1 3.75 mower will not stay running

the engine is not getting enough gas. when you hold down the primer you are bypassing this problem. to fix this simply adjust the carb's fuel screw, located on the side of carb, a little at a time until runs smoothly.

Posted on Jun 25, 2009

Anonymous

  • 3 Answers

SOURCE: My Mower won't stay started after it uses the gas that has been pushing into the mower via the primer bulb

either the magneto or the governor is damaged check them

Posted on May 30, 2009

Joe Hogan

  • 10865 Answers

SOURCE: won't stay running

The carbeurator needs to be cleaned and probably rebuilt. Start with a spray carb cleaner by putting 3 or 4 shots in the carb. Run it for a minute then let it sit for two hours and run it again.

Posted on May 07, 2009

Jeff Hagemann

  • 430 Answers

SOURCE: CRAFTSMAN 5 hp 24 SNOW THROWER, WONT STAY RUNNING

rebuild the carb.

Posted on Nov 30, 2009

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