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Hot Starting

Matronics Email Lists Forum Index -> RotaxEngines-List

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georgewells(at)adelphia.n
Guest

Posted: Mon Aug 21, 2006 5:50 am Post subject: Hot Starting

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
Guest

Posted: Mon Aug 21, 2006 8:17 pm Post subject: Hot Starting

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
Guest

Posted: Tue Aug 22, 2006 5:38 am Post subject: Hot Starting

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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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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