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Posted by jerry.munk on September 3, 2007, 10:12 pm
I have a lawn mower (which I found on the curb) that runs OK for a few
minutes sometimes longer, but inevitably stalls, needs to be re-
primed, and re-started. (But will restart with no wait.) When it dies,
and I go to re-prime it, you can hear and feel that the primer bulb
sucking air at first, turning to a more reasonable fuel sucking sound/
feel at times (or after a few tries).
When I got it I replaced the spark plug, changed out the oil twice,
cleaned out the carb, replaced the fuel line, replaced the needle
valve and a badly deteriorated seat, and put the thing back together.
There seemed to have been some water in the engine, as the first
change of oil was very cloudy. It is a 4.5 hp Briggs and Stratton
12H800, in a Murray 204210X8B.
Not sure where the primer is pulling air from, why it is stalling, or
how to fix the issue (cheaply). Any suggestions would be greatly
appreciated.
Thanks.
Jerry
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Posted by Telstra on September 3, 2007, 11:11 pm
check the air equalisation hole in the fuel cap and
the float valve
show/hide quoted text
>I have a lawn mower (which I found on the curb) that runs OK for a few
> minutes sometimes longer, but inevitably stalls, needs to be re-
> primed, and re-started. (But will restart with no wait.) When it dies,
> and I go to re-prime it, you can hear and feel that the primer bulb
> sucking air at first, turning to a more reasonable fuel sucking sound/
> feel at times (or after a few tries).
> When I got it I replaced the spark plug, changed out the oil twice,
> cleaned out the carb, replaced the fuel line, replaced the needle
> valve and a badly deteriorated seat, and put the thing back together.
> There seemed to have been some water in the engine, as the first
> change of oil was very cloudy. It is a 4.5 hp Briggs and Stratton
> 12H800, in a Murray 204210X8B.
> Not sure where the primer is pulling air from, why it is stalling, or
> how to fix the issue (cheaply). Any suggestions would be greatly
> appreciated.
> Thanks.
> Jerry
>
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Posted by Bob F on September 3, 2007, 11:26 pm
>I have a lawn mower (which I found on the curb) that runs OK for a few
> minutes sometimes longer, but inevitably stalls, needs to be re-
> primed, and re-started. (But will restart with no wait.) When it dies,
> and I go to re-prime it, you can hear and feel that the primer bulb
> sucking air at first, turning to a more reasonable fuel sucking sound/
> feel at times (or after a few tries).
> When I got it I replaced the spark plug, changed out the oil twice,
> cleaned out the carb, replaced the fuel line, replaced the needle
> valve and a badly deteriorated seat, and put the thing back together.
> There seemed to have been some water in the engine, as the first
> change of oil was very cloudy. It is a 4.5 hp Briggs and Stratton
> 12H800, in a Murray 204210X8B.
> Not sure where the primer is pulling air from, why it is stalling, or
> how to fix the issue (cheaply). Any suggestions would be greatly
> appreciated.
Lossen the gas cap a couple turns, and see if the problem goes away. If so, the
vent on the gas cap is not working right.
Bob
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Posted by gfretwell on September 3, 2007, 11:45 pm
On Mon, 03 Sep 2007 19:12:28 -0700, jerry.munk@gmail.com wrote:
show/hide quoted text
>I have a lawn mower (which I found on the curb) that runs OK for a few
>minutes sometimes longer, but inevitably stalls, needs to be re-
>primed, and re-started. (But will restart with no wait.) When it dies,
>and I go to re-prime it, you can hear and feel that the primer bulb
>sucking air at first, turning to a more reasonable fuel sucking sound/
>feel at times (or after a few tries).
>When I got it I replaced the spark plug, changed out the oil twice,
>cleaned out the carb, replaced the fuel line, replaced the needle
>valve and a badly deteriorated seat, and put the thing back together.
>There seemed to have been some water in the engine, as the first
>change of oil was very cloudy. It is a 4.5 hp Briggs and Stratton
>12H800, in a Murray 204210X8B.
>Not sure where the primer is pulling air from, why it is stalling, or
>how to fix the issue (cheaply). Any suggestions would be greatly
>appreciated.
>Thanks.
>Jerry
Are you sure there is no crud in the tank blocking the pickup.
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Posted by xPosTech on September 6, 2007, 10:59 am
On 9/5/2007 8:02 AM, jerry.munk@gmail.com wrote:
show/hide quoted text
> All good suggestions, but sadly all were tried and failed to reveal
> the problem. Gas flows freely through the new gas line; it still
> stalls, even running with the gas cap off (seemed like despite all the
> other gunk on it, the fuel tank was clean); I have blown out the carb
> with cleaner, and all the tiny holes seem to be free of debris (the
> ones I could find, that is).
>
> My next step would probably be to replace all the gaskets in the carb
> -- assuming that one of them is leaking air and causing the engine to
> lose prime. Not sure if that is even remotely resonable though.
> Thoughts?
>
> Thanks for everything so far. I wasn't sure (in Telstra's response)
> what/where the float valve is, but I am happy to check it ...
>
Have you replaced the primer bulb/fuel lines? The kit usually has both
the bulb and lines. About $7 @ Lowes.
--
Ted
I wasn't born in Texas but
I got back here as soon as I could
If you never try anything new, you'll miss out on many of life's great
disappointments.
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> minutes sometimes longer, but inevitably stalls, needs to be re-
> primed, and re-started. (But will restart with no wait.) When it dies,
> and I go to re-prime it, you can hear and feel that the primer bulb
> sucking air at first, turning to a more reasonable fuel sucking sound/
> feel at times (or after a few tries).
> When I got it I replaced the spark plug, changed out the oil twice,
> cleaned out the carb, replaced the fuel line, replaced the needle
> valve and a badly deteriorated seat, and put the thing back together.
> There seemed to have been some water in the engine, as the first
> change of oil was very cloudy. It is a 4.5 hp Briggs and Stratton
> 12H800, in a Murray 204210X8B.
> Not sure where the primer is pulling air from, why it is stalling, or
> how to fix the issue (cheaply). Any suggestions would be greatly
> appreciated.
> Thanks.
> Jerry
>