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Hot Starting

 
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georgewells(at)adelphia.n
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PostPosted: Mon Aug 21, 2006 5:50 am    Post subject: Hot Starting Reply with quote

When my 912S is hot like just after refueling, if I even touch the throttle a 1/4 inch the thing will flood and not start -- Then even if I let it sit for 3 hours like today, still no start ??
Help -- It's in a KF 5
Thanks,
George
[quote][b]


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jkuehn(at)mountaintime.my
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PostPosted: Mon Aug 21, 2006 8:17 pm    Post subject: Hot Starting Reply with quote

Do you have a fuel return? With a return and an auxilliary electric
fuel pump, you just run the electric pump for a minute or two before
attempting to start a hot engine, and the vapor lock gets pumped back to
the gas tank. I did not initially install a fuel return, but did so by
Tee- ing into the fuel linehalf way between the two carbs and running a
line back to the top of the fuel tank. I restricted it very simply by
inserting a grooved plug of threaded stock into the line and clamping it
with a hose clamp to the desired flow rate, about half a US gallon per
hour seems to work fine. Rotax recommends a fuel return.

Jack, flying a Sky Ranger with 100 hours. 912UL

George Wells(at)adelphia.net wrote:

Quote:
When my 912S is hot like just after refueling, if I even touch the
throttle a 1/4 inch the thing will flood and not start -- Then even
if I let it sit for 3 hours like today, still no start ??
Help -- It's in a KF 5
Thanks,
George

*
*



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pwmac(at)sisna.com
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PostPosted: Tue Aug 22, 2006 5:38 am    Post subject: Hot Starting Reply with quote

I did no know Rotax recommended a return line. However the electric
pump is a good feature to allow both carbs to fill before engine
fireing. This helps with the startup shake. For the hot start without
the return line the hot liquid would still be present, but at least I
would think it would start.
Paul
=======
At 10:16 PM 8/21/2006, you wrote:
Quote:

<jkuehn(at)mountaintime.myrf.net>

Do you have a fuel return? With a return and an auxilliary electric
fuel pump, you just run the electric pump for a minute or two before
attempting to start a hot engine, and the vapor lock gets pumped
back to the gas tank. I did not initially install a fuel return,
but did so by Tee- ing into the fuel linehalf way between the two
carbs and running a line back to the top of the fuel tank. I
restricted it very simply by inserting a grooved plug of threaded
stock into the line and clamping it with a hose clamp to the desired
flow rate, about half a US gallon per hour seems to work
fine. Rotax recommends a fuel return.
Jack, flying a Sky Ranger with 100 hours. 912UL

George Wells(at)adelphia.net wrote:

>When my 912S is hot like just after refueling, if I even touch the
>throttle a 1/4 inch the thing will flood and not start -- Then
>even if I let it sit for 3 hours like today, still no start ??
>Help -- It's in a KF 5
>Thanks,
>George
>
>*
>*


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