Experienced gardeners share their insights in answering this question :
Wore out ! either the cylinder has low compression or your crank seals are bad and it caused it to **** air in and run lean and score the cylinder from running hot and lean. pretty common on craftsman.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

Depending on its intended use, a cordless leaf blower with a CFM between 400-700 should be powerful enough to greatly ease your fall yard chores. If you have a small yard with little debris, choose one with 200-400 CFM.
Why won`t my blower start? There are many different reasons why a leaf blower may fail to start, including stale fuel, engine flooding, dirty air filters, faulty spark plugs, defective batteries, blown fuses, and contact issues of the power switch.
The higher the CFM, the larger the area your blower effects and the better you can keep objects moving. You need both to make the most efficient use of your time. If you have high MPH and low CFM, you can get pebbles, mulch, and other large debris to move, but it won`t go very far away from the nozzle.
Most models can put out between 350 and 450 CFM, which is about 190 MPH or more.
The air filter could be blocked.

A common problem that could be keeping your leaf blower from starting is a blocked air filter. Clogged air filters cause the blower`s engine to receive too much fuel and not enough air, which often leads to a faulty start (or no start at all).

If your air handler is running but not blowing air, there are two likely scenarios; either a broken AC blower belt or an issue with the motor itself. If the air handler is humming or buzzing, but not making the mechanical sounds of a motor running, you`re most likely talking about an issue with the motor itself.
WD-40 allows you to clean your generator carburettor within a few minutes without spending additional time and effort. The potent liquid uses a solvent formula for breaking away carbon contaminants within the carburettor, providing you with a clean and healthy machine in no time.
If your leaf blower does not blow air, it is possible that debris has been sucked into the blower housing, impeding the impeller from doing its job. If the impeller is loose or the blades of the impeller are damaged or broken off, it can also cause the blower to become unable to blow air.
Change of fan location to increase blower efficiency

Relocating your blower to reduce its length of runs and straightening bends can help you reduce energy consumption by 5 to 30 percent.

Walk Behind Leaf Blowers

The average walk behind leaf blower has a CFM of 3,000. I would definitely recommend one of these to anyone who needs to cover a large area of land or works with wet/heavy debris on a regular basis.

You should look for a blower with 450-500 CFM and 150-190 MPH ratings.
Any leaf blower that produces at least 400 cubic feet of air per minute (CFM) will get the job done. However, the higher the CFM rating, the faster you will dry your vehicle and EGO manufactures some of the most powerful electric leaf blowers on the market today.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Using the blower worked fine, now will not start at all. have replaced plug, fuel fuel filter , piston looks good no real damage or smudge. good compression and have pulled switch apart and wonder if this could be the problem
ANSWER : Check to see if its getting spark when the switch is on if it is then see if its getting fuel the only two things i can think of would be the switch or needs a carb kit

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My Craftsman 358.797290 blower won’t start. It has 90 #’s compression, good spark and getting fuel on spark plug. It also has fresh gas. It has me frustrated. Can anyone help? Thanks
ANSWER : Exaust manfold get’s clogged

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Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.

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Started PB620-ST yesterday with some difficulty. However, ran until fuel empty. Refueled today, but will not start. Spark at plug ok. Fuel flowing, but seems to overflow into air filter compartment. Does not seem to “fire” at all.
ANSWER : Sounds like your flooding the engine; I did the same thing. Wait a while to let the gas drain back to the tank. Use your primer bulb once and your choke for only ONE pull; then shut off the choke. Pull start without the choke 2-3 times and it should start.

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Fuel lines split hoe to rerplace – Craftsman 4 Cycle Blower/Vac
ANSWER : Hi Rick…Hope this is what your looking forBud

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What kind of spark plug do i use in a pb-251c . i have a champion plug in it now but will not start check fuel filter seem to be ok im getting a spark at the plug and also added fresh fuel what can it be

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It will not start and has no spark. I pulled the plug and let it hang and had no spark. I did the same thing with a spark plug and still no change. Can anyone help me
ANSWER : First of all- your methods of testing spark are … unsatisfactory.
You need a spark tester and a good unit ground to determine the condition of the module.
For preliminary tests the spark plug needs to be grounded. Insert the plug into the spark plug boot and make sure there is a good connection and make sure the plug is grounded by touching the threaded part of the spark plug to a solid engine component. Usually the cooling fins of the cylinder or head. Once the plug is grounded proplerly then pull the rope and check for fire.
Once you are satisfied that there is no spark then unplug the ground wire from the module and check for spark again. If you have spark then its a switch or bad wire problem. If still no spark then replace the module.

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ECHO PB-500T – Stopped running and added gas fuel mix. Quit running again with full tank and now flywheel is stuck and I can’t pull to start it. What is the problem?
ANSWER : My $350 Echo PB-500T seized up. I almost cried.

The solution was to drain the fuel tank.

Refill fuel tank with an 2-cycle Oli/gas mixture.

40:1 =3.2 oz to one-gallon gas, do not use Alcohol base gas.

Remove the spark plug.

Pour approximate 1/8 oz 2-cycle Oli into the spark plug hole.

Remove the pull cord assembly (4-bolts)

This reviled the crank shaft-Pull cord bracket

I use a large monkey wrench to turn the shaft (CW) Clock-wise.

Complete approximate 20 revolutions.

Reassemble, but don’t install the spark plug yet.

Complete approximate 20 more revolutions

by pulling the pull cord.

Use q-tips to swab the top of the piston, as much as possible.

Install the spark-plug and crank, it will smoke for amount 7-10 minutes

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