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Posted by Robert11 on June 28, 2005, 3:44 pm
Hello:
When one pumps the bulb the few times that is required when starting the
typical lawnmower, etc.,
exactly what is one doing ?
a. e.g., does the pumping action just draw gas into the bulb, and then the
next push on the bulb
squirts it into the carb, or... ?
b. If there is gas in the bulb, can one consider the engine "primed" ?
If someone might explain this bulb pumping routine a bit, and exactly what
happens,
would be appreciative. Realize I really don't understand what is happening
Thanks,
Bob
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Posted by on June 28, 2005, 4:53 pm
> Hello:
> When one pumps the bulb the few times that is required when starting the
> typical lawnmower, etc.,
> exactly what is one doing ?
> a. e.g., does the pumping action just draw gas into the bulb, and then the
> next push on the bulb
> squirts it into the carb, or... ?
> b. If there is gas in the bulb, can one consider the engine "primed" ?
> If someone might explain this bulb pumping routine a bit, and exactly what
> happens,
> would be appreciative. Realize I really don't understand what is happening
I don't know how far along the gas is pushed, but what you're doing is
flooding the fuel line (which drains when the engine isn't running) so
that you don't have to pull-start the engine or run the starter for a real
long time while eating up the air in the line.
John
--
Remove the dead poet to e-mail, tho CC'd posts are unwelcome.
Mean People Suck - It takes two deviations to get cool.
Ask me about joining the NRA.
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Posted by Jeff Wisnia on June 28, 2005, 6:38 pm
raven@westnet.poe.com wrote:
>
>>Hello:
>
>
>>When one pumps the bulb the few times that is required when starting the
>>typical lawnmower, etc.,
>>exactly what is one doing ?
>
>
>>a. e.g., does the pumping action just draw gas into the bulb, and then the
>>next push on the bulb
>>squirts it into the carb, or... ?
>
>
>>b. If there is gas in the bulb, can one consider the engine "primed" ?
>
>
>>If someone might explain this bulb pumping routine a bit, and exactly what
>>happens,
>>would be appreciative. Realize I really don't understand what is happening
>
>
> I don't know how far along the gas is pushed, but what you're doing is
> flooding the fuel line (which drains when the engine isn't running) so
> that you don't have to pull-start the engine or run the starter for a real
> long time while eating up the air in the line.
>
>
> John
You are correct John, it pulls fuel up from the tank, but it does
actually push fuel into the "carb" bore. If you push it too many times
you can "flood" the engine.
Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Truth exists; only falsehood has to be invented."
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Posted by Gideon on June 28, 2005, 9:32 pm
Robert,
It has always been my impression that there are 2 types of primers for
small gasoline engines:
1) One type primes the combustion chamber by squirting raw gasoline
into the fuel intake.
2) The second type primes the carb by pumping gasoline into the fuel bowl.
One crude method of determining the type of primer is by observing the
priming instructions. If you are priming the combustion chamber, then
you'll be instructed to pump the primer just a few times. If you are
priming the carb fuel bowl, then you are probably instructed to pump
more times.
A better method is to test the primer while the engine is running. Have
another person rapidly pump the primer while the engine is running. Ten
very rapid pumps should work fine. If the engine operation is not changed
with all of that priming, then the primer delivers gas to the fuel bowl
and not to the combustion chamber. But if the engine sputters or stalls,
then the primer is delivering fuel to the combustion chamber and the rapid
primer while running is flooding the engine with too much gasoline. Often
this will cause the engine to sputter and stall.
I've never read any of this anywhere and it is just what I've picked up
over the years. I have small gasoline engines which display both sets
of behaviors, so I'm a believer that there are 2 priming methods.
Good luck,
Gideon
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Posted by Rolling Thunder on June 29, 2005, 11:01 am
wrote:
>Hello:
>
>When one pumps the bulb the few times that is required when starting the
>typical lawnmower, etc.,
>exactly what is one doing ?
>
>a. e.g., does the pumping action just draw gas into the bulb, and then the
>next push on the bulb
>squirts it into the carb, or... ?
>
>b. If there is gas in the bulb, can one consider the engine "primed" ?
>
>If someone might explain this bulb pumping routine a bit, and exactly what
>happens,
>would be appreciative. Realize I really don't understand what is happening
>
>Thanks,
>Bob
>
Pull off the air cleaner and take a look down the carb while pressing
the primer bulb and see what happens. You'll see the gas squiring
towards the engine intake.
Thunder
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