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  #1  
Old 12-24-2014, 04:07 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 774
Default Carb ma4spa

Frustrated!
I took my carb that, was running just fine, off to install the metal float kit. Put it back together using the 7/32 float dimension. Put it back on, it started and ran but was too rich. I took it off and lowered the float level using 9/32 dimension. Put it on and it leaked fuel from the vent on the bottom. Took it to the shop where a fuel tech reset the float to 7/32 tested the needle and seat( good) and tested it on the flow bench. All checks good. I put it back on the engine and it leaks even worse now. The float is not sinking.
Any ideas?
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  #2  
Old 12-24-2014, 06:17 PM
Sid Lambert Sid Lambert is offline
 
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Default

You may have a tiny bit of trash under the needle. It happens.

Take it out and examine the needle & seat.
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  #3  
Old 12-24-2014, 06:45 PM
Christopher Murphy Christopher Murphy is offline
 
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Location: colorado
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Default float kit

I installed the kit that the kelly aerospace rep at oshkosh told me was the correct one. He gave me the part number.

Ive had it open 3 times...condition and trash in the needle seat were checked by me and the fuel tech..as well as integrity of the float.

Its got me baffled?
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  #4  
Old 12-24-2014, 06:49 PM
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LifeofReiley LifeofReiley is offline
 
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Put it back as it was...
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  #5  
Old 12-24-2014, 07:07 PM
Christopher Murphy Christopher Murphy is offline
 
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Default im tempted to

I am tempted to put the white float back in...
i hate fixing things that arent broken..
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  #6  
Old 12-24-2014, 08:54 PM
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LifeofReiley LifeofReiley is offline
 
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Yes Sir... if its not broke, don't try to fix it.
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  #7  
Old 12-25-2014, 12:55 AM
PCHunt PCHunt is offline
 
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IIRC, the metal floats are not the latest version. The newest ones are blue epoxy. I just installed a float kit in my MA4-SPA carb with no issues. Removed the older but functional metal (brass) floats.

YMMV
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  #8  
Old 12-25-2014, 06:00 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Quote:
Originally Posted by Christopher Murphy View Post
I am tempted to put the white float back in...
i hate fixing things that arent broken..
Definately DO NOT put the white plastic float back in, those are the ones that caused all the problems.
What is your fuel pressure running? (4-6 psi is normal)
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  #9  
Old 12-25-2014, 06:15 AM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 774
Default metal float

The kelly aerospace guys said to go with the metal float. we had a long discussion about which float should be in the carb
we tested the needle and seat at 6 psi on a flow bench... it was fine.

put on the airplane and it pisses fuel out. 4psi max on the plane

it shouldnt be rocket science..lol

I will eventually figure it out but I was wondering if there was something else
that might cause that isse

merry christmas
cm
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Mr. Twister Airshows
Rocky Mountain Renegades
the mission... have fun.
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  #10  
Old 12-25-2014, 06:29 AM
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Walt Walt is offline
 
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My carb shop would agree, the brass float is fine and they will re-use those but the white ones get replaced with the new ones because the brass is no longer available.

You may just take the carb off and hold it level to see if the same thing still happens, perhaps the steep angle is causing the issue somehow. I would also double check the FP with a seperate gauge just to be sure.
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EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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