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post #1 of 10 (permalink) Old 10-11-2020, 08:33 AM Thread Starter
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Craftsman Leaf Vac

I have a craftsman leaf vac machine with a Briggs engine. The only way I can get the machine to start is by squirting a bit of gas directly into carb. After that it runs well as long as I do not shut it down. Thoughts?


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post #2 of 10 (permalink) Old 10-11-2020, 10:46 PM
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Choke problem maybe? Does it have a primer button or auto choke?


What is your engine model numbers or the Craftsmen model number of the unit? Using those numbers we can look it up and better tell what might be going on as carburetor designs vary a fair bit from old to new.

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post #3 of 10 (permalink) Old 10-13-2020, 06:24 PM Thread Starter
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Craftsman Leaf Vac

Thanks for the reply Mark.
The machine has a manual choke.


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post #4 of 10 (permalink) Old 10-15-2020, 03:04 PM Thread Starter
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Engine code


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post #5 of 10 (permalink) Old 10-16-2020, 02:10 AM
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Surprised to see a manual choke lever on that. Might try a new spark plug if you haven't already and make sure the gap on the plug is correct. Also make sure when you close the choke lever the linkage is pulling the choke butterfly in the carburetor intake manifold closed. You can look up parts and download an owners manual if you don't have one from Sears website:


https://www.searspartsdirect.com/mod...n-vacuum-parts


If still having starting trouble might be some gum in the carburetor restricting the fuel flow or a partly plugged fuel jet. Does it start okay when warm and only having trouble on cold starts?

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post #6 of 10 (permalink) Old 10-16-2020, 06:10 AM Thread Starter
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Craftsman Leaf Vac

It will not start without a squirt of gas regardless of cold or warm. I did check the spark plug and it’s got a great spark. It just doesn’t seem to want to pull fuel until it’s running off a squirt directly into the carb.
What item on the carb diagram is the “fuel jet”?


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Last edited by BlueHonda; 10-16-2020 at 06:19 AM.
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post #7 of 10 (permalink) Old 10-16-2020, 09:53 AM
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The air filter housing (part # 159) shows there may be a primer bulb on it. Does your motor have a primer bulb?

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post #8 of 10 (permalink) Old 10-16-2020, 06:24 PM Thread Starter
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No primer bulb on this machine.


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post #9 of 10 (permalink) Old 10-17-2020, 11:51 AM Thread Starter
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Update. Pulled the carb and soaked all normal parts in my gallon parts cleaner. The good news the machine does seems to start without a squirt of gas but does not like to run without the choke mostly closed.
Thoughts?


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post #10 of 10 (permalink) Old 10-17-2020, 07:00 PM
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If it needs some choke to run, you have a still dirty carb causing a lean condition OR an air leak in the gaskets or intake manifold. Those plastic intakes have been known to develop cracks.

https://outdoorpowerinfo.com/repairs...o_lms_carb.asp

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