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Carbs leaking

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2 months 1 week ago #22099 by Flying Moose
Carbs leaking was created by Flying Moose
I have a 2017 Tecnam P2008. 108hrs current. About three months ago I started having fuel leaks out the overflow trays. Long story short we have talked to Lockwood three times and done everything they have said. Change the needles, weighed the floats, drilled out the floats. We are on round four now and we are getting no help. I have finally went back to Tecnam for help to get Lockwood to do something. We still have fuel leaking out the trays when the plane is setting still. I would say it is a significant leak and fuel is puddled up on the floor every time I come into the hanger. Engine is running fine and always has run great. I am under warranty but I am not getting any warranty help, only advice with no offer to pay for the repairs. I bought a newer model demo so I would have a warranty but so far a no go on warranty help. Just bad advice so far. HELP Just want my engine fixed.

Mike Nevins

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2 months 1 week ago #22101 by Roger Lee
Replied by Roger Lee on topic Carbs leaking
"drilled out the floats". Never heard of this.

Only a couple things can make carbs over flow.
Before we look at those things the fuel should ALWAYS be shut off when your done flying for the day and more important for a high wing with the tanks in the wing. If a carb leaks and with the head pressure from the high wing and the fuel there is nothing to keep it from draining if it leaks. Low wings aren't usually affected like this.

So here are the things that may be causing this.
The floats are too heavy and sinking. They should be under 7 grams as a set of two. This is supposed to be done at every annual now.
The floats are rubbing and sticking against the bowl side wall because the pin is bent.
The Viton tipped needle valve is worn, damaged or has debris keeping it from sealing.
The float armature is not adjusted to the proper level. The carb needs to be out of of the plane and upside down to check this and set it.

My money lies on one of these.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
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2 months 1 week ago #22103 by tomkk
Replied by tomkk on topic Carbs leaking

Flying Moose wrote: I have a 2017 ... drilled out the floats.


As a matter of curiosity, what did you drill and what was it supposed to accomplish?

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2 months 1 week ago #22104 by Emm01@#$
Replied by Emm01@#$ on topic Carbs leaking
Roger is spot on, but i am also curious , drill where and for what reason?
gene

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2 months 1 week ago #22105 by DHeal
Replied by DHeal on topic Carbs leaking
Sounds strange. Some outside-of-the-box thinking here: Is there any aspect of the airframe's fuel system design that might cause the fuel line serving the carbs to become somewhat pressurized after engine shut-down? Residual heat after shut-down might cause expansion of the fuel trapped in the lines causing venting through the carbs?? Any one-way fuel valves, pumps, etc??? As Roger noted, the fuel head pressure associated with the high-wing configuration may be an issue.

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2 months 1 week ago #22121 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
Thank you guys for the quick response. We never had any leaks for the first three months. I am OK to turn off the fuel valve but I still want the leak fixed. Lockwood suggested turning off the fuel value as a fix and that is not acceptable. I cannot tell you about why we had to drill the floats out it was done by the mechanics at the Rotax repair shop under Lockwoods direction. Now Lockwood is suggesting I get new floats from Leading Edge Air Foils in Wisconsin. This is based on a service bulletin that was sent to me. I asked Tecnam the same question DHeal and they said they did not feel that was the issue. Right now we just soak up the extra fuel from the tray before we go out to fly. I will send Rogers response to my mechanic and see what he says. He is not a Rotax certified mec but at least I would not have to have my plane gone for six weeks like last time. Lockwood did not pay for the labor any way. I have never had such poor warranty response on anything I have owned so far.

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2 months 1 week ago #22123 by kenryan
Replied by kenryan on topic Carbs leaking
From what you have told us, I can't figure out why Lockwood would not fix this under warranty. What does he say when you ask him why he's not fixing it under warranty? What's his justification?

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2 months 1 week ago #22124 by brotax
Replied by brotax on topic Carbs leaking
Could you please explain why you drilled the floats?

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2 months 1 week ago #22125 by brotax
Replied by brotax on topic Carbs leaking
One more question, is this a 912 or 914?

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2 months 1 week ago #22137 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
This is a 912 100hp

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2 months 1 week ago #22138 by brotax
Replied by brotax on topic Carbs leaking
Would you mind explaining the drilling of the floats?

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2 months 1 week ago #22139 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
Sent a request out to the mechanic that did this and will let you know.

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2 months 1 week ago #22140 by brotax
Replied by brotax on topic Carbs leaking
Perfect thank you.

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2 months 1 week ago #22142 by garrett
Replied by garrett on topic Carbs leaking
Have you checked the tank vent/venting system for proper operation?
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2 months 1 week ago #22149 by Flocker
Replied by Flocker on topic Carbs leaking

Flying Moose wrote: I have a 2017 Tecnam P2008. 108hrs current.

Mike Nevins


Sorry to hear about the carb leaks. By the way, are you on Tecnam Talk?

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2 months 1 week ago #22150 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
No I am not on Tecnam talk. How do you get on it. The only thing I am getting out of Rotax is try this or that and no warranty coverage so far. They just keep dodging me and sending me off to someone else. Now I have to go and buy new bowls and pay to have them installed myself. It is not worth all the hassle to fly it to a certified center. I have tried that I am not getting any better results. Had my plane setting six weeks and no improvement. Not at all impressed with Rotax. My engine runs great and I love my plane just frustrated about this issue.

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2 months 1 week ago #22152 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
We checked the venting and all is good there.

Mike

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2 months 1 week ago #22155 by brotax
Replied by brotax on topic Carbs leaking
What is wrong with the current bowls?
I would still like to know the theory behind drilling the floats. The more info we get the easier troubleshooting will be.

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2 months 1 week ago #22157 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
Trying to get that info on drilling the floats from the mec that did it.

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2 months 1 week ago #22158 by Flying Moose
Replied by Flying Moose on topic Carbs leaking
"lapped Carb float needle valve." It looks like my drilling comments were off. Not sure where I heard that. This is what was done the last time it was in for service.

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