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06-01-2011, 08:59 AM
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Join Date: Oct 2005
Location: Chicago sw suburbs
Posts: 395
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carb fitting wont screw in
I have tried various -6 fittings to attach the fuel pump hose to my carb MA-4spa and none of them would go in more than a third of a turn by hand before they stop. Should I put a wrench on it and apply force to it or is there something I'm missing here? Is there a specially threaded fitting for this?
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06-01-2011, 09:21 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,665
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Is it safe to assime you were using an AN fitting with a 1/4" pipe thread like an AN823-6 ??
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Walt Aronow, DFW, TX (52F)
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, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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06-01-2011, 12:03 PM
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Super Moderator
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Join Date: Jan 2005
Posts: 266
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Do not force the fittings!!!!! The fuel inlet and outlet on the fuel pump are not pipe thread! The fitting for this purpose has machine thread, uses an O- ring and has a washer and jam nut. You can find them in Van,s catalog.
Martin Sutter
building and flying RV's since 1988
EAA Technical Counselor
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06-01-2011, 12:21 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,583
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carb
MA4SPA carb----anything special about this?
Tom
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Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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06-01-2011, 12:53 PM
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Super Moderator
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Join Date: Jan 2005
Posts: 266
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Sorry, not the carb but only the pump have machine thread fittings. Carb should pipe thread.
Martin Sutter
Building and flying RV's since 1988
EAA Technical Counselor
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06-01-2011, 01:04 PM
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Join Date: Oct 2007
Location: Canada
Posts: 100
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Carb fitting
It is possible that the carb threads are not pipe thread. My MA4SPA has straight threads. Just for fun remove the fuel fitting from the mechanical fuel pump and see if it threads in.
Matt
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C-GVMK
RV9a Slow(ly) built
Flying as of July 2012
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06-01-2011, 01:12 PM
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Join Date: Jan 2011
Location: Sacramento, CA
Posts: 26
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If you are referring to the part number 95-509 finger-screen inlet fitting for the carburetor, it uses a national pipe straight fuel thread (.250-18 NPSF). You often see an NPT fitting screwed into the finger inlet screen- this is not technically correct.
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06-01-2011, 02:34 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,583
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John -
John would know!!
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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06-01-2011, 03:24 PM
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Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,390
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fuel pump
AN 833-6 fitting with AN924-6 nut. Straight thread on both ends of fitting. o ring under the nut, hold the fitting from rotating and tighten the nut to squeeze the o ring. Fittings are also available in straight AN832 and 45- AN837 There are other fitting options but the above has been used successfully on many Pipers. The carb fitting is a straight thread to accept the inlet screen, the screen in turn will accept a pipe thread fitting, AN822-6 would be one exaMPLE.
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06-01-2011, 04:46 PM
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Join Date: Sep 2007
Location: Albuquerque, NM
Posts: 659
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Quote:
Originally Posted by john.schwaner
If you are referring to the part number 95-509 finger-screen inlet fitting for the carburetor, it uses a national pipe straight fuel thread (.250-18 NPSF). You often see an NPT fitting screwed into the finger inlet screen- this is not technically correct.
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Where can one buy the NPSF fitting?
__________________
Andy Compton, PhD EE
RV-10 - #41414 (building)
RV-9A - N643AC (built,flying,sold,missed)
My blood and sweat, the Wifey's tears 
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