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Craftsman mower won't stay running 46erjoe 07-02-2006
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Posted by 46erjoe on July 2, 2006, 1:23 pm
Got this Craftsman model 917 6-hp lawn mower for free when I got a new
house. It starts up fine, but runs for only about 30 seconds and then
stops.

I know what you're thinking: Fuel delivery problem. I thought so too.
I pulled off the tank emptied it, blew it dry and put it back on with
fresh gas. The screen at the bottom of the tank is clear.

If I prime it more than the 5 suggested times, it says, it stays
running longer.

I did this quite a few times in order to get it hot, but it still
keeps on shutting down.

The carb is tight to the block. I tried leaving the gas cap on and off
to see if venting was an issue. Still kept doing the same thing.

The air filter was dirty, so I left it off while testing. Still won't
run.

Any suggestions?

Posted by John Lawrence on July 2, 2006, 4:01 pm
It still sounds like a fuel delivery problem. It runs when you use the prime
bulb. It will not stay running when the prime is burned. I would suggest
that the carb is gummed up and needs to be cleaned. You should also invest
in a carb. kit.
> Got this Craftsman model 917 6-hp lawn mower for free when I got a new
> house. It starts up fine, but runs for only about 30 seconds and then
> stops.
>
> I know what you're thinking: Fuel delivery problem. I thought so too.
> I pulled off the tank emptied it, blew it dry and put it back on with
> fresh gas. The screen at the bottom of the tank is clear.
>
> If I prime it more than the 5 suggested times, it says, it stays
> running longer.
>
> I did this quite a few times in order to get it hot, but it still
> keeps on shutting down.
>
> The carb is tight to the block. I tried leaving the gas cap on and off
> to see if venting was an issue. Still kept doing the same thing.
>
> The air filter was dirty, so I left it off while testing. Still won't
> run.
>
> Any suggestions?



Posted by Oren on July 2, 2006, 4:33 pm
On Sun, 02 Jul 2006 20:01:53 GMT, "John Lawrence"

>It still sounds like a fuel delivery problem. It runs when you use the prime
>bulb. It will not stay running when the prime is burned. I would suggest
>that the carb is gummed up and needs to be cleaned. You should also invest
>in a carb. kit.

I agree about the fuel starve. I was thinking a stuck float, and or
valve. Sometimes a tap or two with a screwdriver handle can knock
things loose.

If the OP can start it and try spraying some starting fuel in the carb
and try to keep it running a little longer would make me rebuild the
carb.

Oren

Posted by David Efflandt on July 4, 2006, 4:53 am
> It still sounds like a fuel delivery problem. It runs when you use the prime
> bulb. It will not stay running when the prime is burned. I would suggest
> that the carb is gummed up and needs to be cleaned. You should also invest
> in a carb. kit.

Could be. I got a Sears mower with my house in 2002 and it ran fine for a
several years, but this year it will prime, but not stay running. One
problem is that there is no fuel shutoff, so you cannot run it dry when
finished. Gas in the carb probably evaporates leaving residue that gums
up the carb eventually. But no fuel shutoff also makes it hard to clean
the carb when you have a full tank of gas.

Fortunately I also have a good old fashioned 2-cycle Lawnboy (after Toro
bought them out). It has a fuel shutoff, so I can run it dry to avoid
carb gum up. And it started right up after not running for years.

Posted by Bob on July 6, 2006, 9:34 pm

> > It still sounds like a fuel delivery problem. It runs when you use the prime
> > bulb. It will not stay running when the prime is burned. I would suggest
> > that the carb is gummed up and needs to be cleaned. You should also invest
> > in a carb. kit.
>
> Could be. I got a Sears mower with my house in 2002 and it ran fine for a
> several years, but this year it will prime, but not stay running. One
> problem is that there is no fuel shutoff, so you cannot run it dry when
> finished. Gas in the carb probably evaporates leaving residue that gums
> up the carb eventually. But no fuel shutoff also makes it hard to clean
> the carb when you have a full tank of gas.

Running them dry is something I do only at the end of the season. It doesn't
seem to be a problem when used regularly.

Bob



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