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Fuel spilling out of carb intake

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Catz631(at)aol.com
Guest

Posted: Mon Mar 10, 2008 4:18 am Post subject: Fuel spilling out of carb intake

My newest problem ,after continuous work on my low time 150 hour old 912(replacing hoses,fittingsetc), is that I am having alot of fuel accumulation on the fire wall and dripping out of the flat K&N filters after I uncowl the engine at shutdown. I ran the 912 without the cowl and of course with the airflow it is difficult to determine where it is coming from.The float bowls appear dry and it looks like it is dripping out of the carb inlets.(as I can see oil accumulation below the filter on the firewall I recently oiled the filters and a  mix of gas and oil tells the tale. First it was one carb now both ! I have recently replaced the rubber diaphrams (age),float needles and reset the jet needles to number 3 position .  I have the old carbs without the o ring for needle stabilization The engine runs fine and I did not notice any problems with fuel leakage until just recently. Would loose jet needles cause this ? The needle fixation screw was installed with a very light smear of locktite and are very easy to turn with a screw driver.I could redo them if that is the problem.I also noticed the float brackets are cupped where the old float needles resided.I need to replace them I know.Would that cause the problem? How about the float level somehow getting out of whack? (although it was fine) Any ideas would sure help.

                       Thanks,

                                   Dick Maddux

                                   Fox 4-1200

                                   912UL

                                   Pensacola,Fl  



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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Mon Mar 10, 2008 5:37 am Post subject: Fuel spilling out of carb intake

Dick-

Did you get the exact same float needles? I'm referring to the  

strength of the springs inside the float needle. They come in 2 or 3  

different spring strengths, I think. I don't know "jack" about Rotax  

carbs...Bings?....but a leaky float needle and seat (did you change  

seats?) will cause what you describe, or at least in my Bing carb on  

a Jabiru it did.

The fact that you changed the float needles could have changed the  

float level if the new needles were a slightly different length, or  

possibly a different spring strength.

If Rotax carbs don't use the spring-loaded float needles....well,  

never mind. : )



Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/475+ hrs

On Mar 10, 2008, at 8:16 AM, Catz631(at)aol.com wrote:



 	  Quote: 	
		   My newest problem ,after continuous work on my low time 150 hour  

 old 912(replacing hoses,fittingsetc), is that I am having alot of  

 fuel accumulation on the fire wall and dripping out of the flat K&N  

 filters after I uncowl the engine at shutdown. I ran the 912  

 without the cowl and of course with the airflow it is difficult to  

 determine where it is coming from.The float bowls appear dry and it  

 looks like it is dripping out of the carb inlets.(as I can see oil  

 accumulation below the filter on the firewall I recently oiled the  

 filters and a  mix of gas and oil tells the tale. First it was one  

 carb now both ! I have recently replaced the rubber diaphrams  

 (age),float needles and reset the jet needles to number 3  

 position .  I have the old carbs without the o ring for needle  

 stabilization The engine runs fine and I did not notice any  

 problems with fuel leakage until just recently. Would loose jet  

 needles cause this ? The needle fixation screw was installed with a  

 very light smear of locktite and are very easy to turn with a screw  

 driver.I could redo them if that is the problem.I also noticed the  

 float brackets are cupped where the old float needles resided.I  

 need to replace them I know.Would that cause the problem? How about  

 the float level somehow getting out of whack? (although it was  

 fine) Any ideas would sure help.

                       Thanks,

                                   Dick Maddux

                                   Fox 4-1200

                                   912UL

                                   Pensacola,Fl



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 www.matronics.com/contribution _- 

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Mar 10, 2008 6:46 am Post subject: Fuel spilling out of carb intake

How about a leak in the fuel lines which could put a fine spray on the filters.  Just me, I tend to look for the simple things first.  

   

   

Noel Loveys  

AME Intern, RPP  

Kitfox III-A, 582,B box being changed to 912UL  

Ivo IFA, Aerocet 1100 floats  

   

   

       

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Catz631(at)aol.com

 Sent: Monday, March 10, 2008 9:46 AM

 To: kitfox-list(at)matronics.com

 Subject: Fuel spilling out of carb intake  

  

  

     

My newest problem ,after continuous work on my low time 150 hour old 912(replacing hoses,fittingsetc), is that I am having alot of fuel accumulation on the fire wall and dripping out of the flat K&N filters after I uncowl the engine at shutdown. I ran the 912 without the cowl and of course with the airflow it is difficult to determine where it is coming from.The float bowls appear dry and it looks like it is dripping out of the carb inlets.(as I can see oil accumulation below the filter on the firewall I recently oiled the filters and a  mix of gas and oil tells the tale. First it was one carb now both ! I have recently replaced the rubber diaphrams (age),float needles and reset the jet needles to number 3 position .  I have the old carbs without the o ring for needle stabilization The engine runs fine and I did not notice any problems with fuel leakage until just recently. Would loose jet needles cause this ? The needle fixation screw was installed with a very light smear of locktite and are very easy to turn with a screw driver.I could redo them if that is the problem.I also noticed the float brackets are cupped where the old float needles resided.I need to replace them I know.Would that cause the problem? How about the float level somehow getting out of whack? (although it was fine) Any ideas would sure help.  

    

                      Thanks,  

    

                                  Dick Maddux  

    

                                  Fox 4-1200  

    

                                  912UL  

    

                                  Pensacola,Fl    

  



 

         

  

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

halme(at)aol.com
Guest

Posted: Mon Mar 10, 2008 8:43 am Post subject: Fuel spilling out of carb intake

We had the same problem, turned out to be the floats sticking down, fix is a new design float from rotax.  Hal IV speedster

 

 

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clint_bazzill(at)hotmail.
Guest

Posted: Mon Mar 10, 2008 1:17 pm Post subject: Fuel spilling out of carb intake

Are you using a boost pump?

  

 Clint



 [quote]  From: Catz631(at)aol.com

Date: Mon, 10 Mar 2008 08:16:23 -0400

Subject: Fuel spilling out of carb intake

To: kitfox-list(at)matronics.com



  My newest problem ,after continuous work on my low time 150 hour old 912(replacing hoses,fittingsetc), is that I am having alot of fuel accumulation on the fire wall and dripping out of the flat K&N filters after I uncowl the engine at shutdown. I ran the 912 without the cowl and of course with the airflow it is difficult to determine where it is coming from.The float bowls appear dry and it looks like it is dripping out of the carb inlets.(as I can see oil accumulation below the filter on the firewall I recently oiled the filters and a  mix of gas and oil tells the tale. First it was one carb now both ! I have recently replaced the rubber diaphrams (age),float needles and reset the jet needles to number 3 position .  I have the old carbs without the o ring for needle stabilization The engine runs fine and I did not notice any problems with fuel leakage until just recently. Would loose jet needles cause this ? The needle fixation screw was installed with a very light smear of locktite and are very easy to turn with a screw driver.I could redo them if that is the problem.I also noticed the float brackets are cupped where the old float needles resided.I need to replace them I know.Would that cause the problem? How about the float level somehow getting out of whack? (although it was fine) Any ideas would sure help.

                       Thanks,

                                   Dick Maddux

                                   Fox 4-1200

                                   912UL

                                   Pensacola,Fl  



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arget=_blank>http://www.matronics.com/Navigator?Kitfox-List

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blank>http://www.matronics.com/contribution



	
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kitfoxpilot(at)msn.com
Guest

Posted: Mon Mar 10, 2008 3:01 pm Post subject: Fuel spilling out of carb intake

Guess what, I am having the same problem and I just got both carbs back from Lockwood aviation clean and re-build! man I'm about to pull my hair out.

 Ray

  	  Quote: 	
		    From: clint_bazzill(at)hotmail.com

To: kitfox-list(at)matronics.com

Subject: RE: Fuel spilling out of carb intake

Date: Mon, 10 Mar 2008 21:14:52 +0000

   .ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass EC_body.hmmessage {font-size:10pt;font-family:Tahoma;}  

Are you using a boost pump?

Clint

  	  Quote: 	
		    From: Catz631(at)aol.com

Date: Mon, 10 Mar 2008 08:16:23 -0400

Subject: Fuel spilling out of carb intake

To: kitfox-list(at)matronics.com

 My newest problem ,after continuous work on my low time 150 hour old 912(replacing hoses,fittingsetc), is that I am having alot of fuel accumulation on the fire wall and dripping out of the flat K&N filters after I uncowl the engine at shutdown. I ran the 912 without the cowl and of course with the airflow it is difficult to determine where it is coming from.The float bowls appear dry and it looks like it is dripping out of the carb inlets.(as I can see oil accumulation below the filter on the firewall I recently oiled the filters and a  mix of gas and oil tells the tale. First it was one carb now both ! I have recently replaced the rubber diaphrams (age),float needles and reset the jet needles to number 3 position .  I have the old carbs without the o ring for needle stabilization The engine runs fine and I did not notice any problems with fuel leakage until just recently. Would loose jet needles cause this ? The needle fixation screw was installed with a very light smear of locktite and are very easy to turn with a screw driver.I could redo them if that is the problem.I also noticed the float brackets are cupped where the old float needles resided.I need to replace them I know.Would that cause the problem? How about the float level somehow getting out of whack? (although it was fine) Any ideas would sure help.

                       Thanks,

                                   Dick Maddux

                                   Fox 4-1200

                                   912UL

                                   Pensacola,Fl  

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arget=_blank>http://www.matronics.com/Navigator?Kitfox-List

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arget=_blank>http://www.matronics.com/Navigator?Kitfox-List

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Catz631(at)aol.com
Guest

Posted: Tue Mar 11, 2008 5:45 am Post subject: Fuel spilling out of carb intake

Thanks for all the replies. I don't have a boost pump and I think this whole thing started when I replaced the float needles. I will probably put the old one's back in. In the meantime I called Lockwood and the tech told me that the cupping on my float brackets could cause the fuel to spill out of the carb intake and also the Kitfox is prone to this because of the pendulum effect of the carbs out on the ends of the intakes. They shake a lot and the float needles bounce up and down I guess. So I ordered a set of float brackets and will try that ,then on to the floats. All I know at this point is I did not have the problem previously and was only replacing items do to the recommended replacement age. Apparently from the replies, I am not the only one that is having this problem so I will keep you posted

  

                                                Dick Maddux

                                                Fox 4-1200

                                                Rotax 912 UL

                                                Pensacola,Fl



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