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I have a craftman yard vac with a tecmseh 4.5. She has failed to

She has failed to start even after replacing spark plug and filling up with fresh gas. She attempts to accelarate but shuts down after several second. Can u help.Model # Craftman 247770110

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Hi gr2954;

Lots of the starting problems with 2 cycle engines (weed eaters, blowers, chain saws, etc) are caused by leaving them stored for long periods of time with the oil/gas mixture left in them. what happens is that a residue forms on parts in the carb.

Try the following: empty the fresh gas out of the blower. add a gas stabilizer to the existing gas you plan to put in the blower. You can get this stabilizer at any auto parts store. While you are there get a can of spray start fluid. Put the fresh, modified gas in the blower. Take the spark out and spray some starter fluid in the plug hole.Replace the spark plug and try to start the engine.It will probably take a few cycles of doing this to get the blower to stay running.
when you put the blower up for a long period, empty the remaining gas out then start the engine and run it till it stops. this gets the remaining gas out of the carb.

Posted on Nov 30, 2008


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Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

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Lawnmower wont start

Possible Causes Corrective actions
Unit will not start Control handle is not engaged Engage control handle spacer.gif spacer.gif
Spark plug wire is disconnected Connect spark plug wire spacer.gif spacer.gif
Fuel tank empty or stale fuel Replace with clean, fresh gas spacer.gif spacer.gif
Blocked fuel line Clean fuel line spacer.gif spacer.gif
Faulty spark plug Replace, clean, or adjust gap spacer.gif spacer.gif
Engine flooded Wait to restart, do not prime spacer.gif spacer.gif
Air filter filled with dirt or debris Replace or clean air filter

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Leave blower and vac

I don't mean to over simplify this, but are you using fresh gas? Gas blowers and string trimmers are extremely ticky when it comes to gas. They like it SUPER fresh. Not just fresh from the can, but fresh from the pump! And while the gas and oil mixture should be right, it can be off a little bit and still run. Try draining all of the gas out, and then filling up with fresh mix. This is ALWAYS my first step with string trimmers and blowers, and it fixes the problem 75% of the time. Also make sure your spark plug is clean. If you are not sure, a new plug couldn't hurt.
Hope this helps!!


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