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Bing carb on Jab3300

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chris Sinfield

Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia

Posted: Mon Feb 05, 2007 10:07 pm Post subject: Bing carb on Jab3300

I found this on the Yahoo Jab Engine site any one had similar problems as the fuel pump that was sent with my XL kit was the 40105

Chris..



 frm the site.....



first engine start went well except that i had fuel leaks from the bing

carb. i have a facet 40105 electric fuel pump that really overpowered

the needle valve controlled by the floats. this is the pump i understand

is used by many jab owners. after a short engine run without the elec.

pump i shut the engine down as the manual pump was also causing fuel to

leak. leaks were coming out the vent for the fuel bowl.

i spoke to bing and was told that these needle assemblies come with

several spring stiffnesses. i had the weakest spring assembly. bing is

sending me the medium stiffness spring. bing said the stiffest spring is

too stiff and not offered any more. bing said a pulolator pressure

regulator is commonly installed in the fuel line. bing also said they

get a lot of calls for the same problem from a lot of 40105 owners.

maybe i should be looking at a facet pump of around 2-2.5 lbs. i believe

they are made and would be more desireable because these lower pressured

pumps have no check valves. thus no possible valve to stick.

does anyone have anything to add to this or offer any fuel pressure

info? 

and also, jim of pacific jabiru was helpful and patient with my phone

calls as all of this was going on during the first start attempt.

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Tue Feb 06, 2007 8:06 am Post subject: Re: Bing carb on Jab3300

We were warned about this problem at a class held by Pete Krotje of US Jabiru.  You want to keep the fuel pressure below 3 psi. The correct pump is a 40104 - A/C spruce doesn't list it but they carry it.



You can also go to Carquest -  they carry two versions under their own name but made by Facet - I believe you want the Red Labeled version.  It is the identical pump.



Tim

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_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

tonyplane(at)bellsouth.ne
Guest

Posted: Tue Feb 06, 2007 8:34 am Post subject: Bing carb on Jab3300

The Facet 40105 has been working fine on my XL/Jab3300  for over 200 hours. 

The Bing

also has given me no problems and has been working smoothly up to 12,500 ft. 

(max I

have cruised at to date)

For info, below are excerpts from my POH on the fuel system in my XL.

Tony Graziano

601XL; N493TG, 204 hrs

--------------------------------------------

B.  FUEL SYSTEM

The engine is fitted with an altitude adjusting Bing Carburetor.  The 

throttle is controlled via a cable to the carburetor.  The carburetor has a 

choke for cold starting and is controlled via a cable to the choke.  Fuel is 

screened by a small finger strainers in the fuel tanks, a gascolator located 

on the aircraft C/L below the cockpit before the rudder peddles and just 

prior to the electric fuel pump, and filtered between the firewall and the 

mechanical fuel pump.  There is no priming system.  Fuel travels from the 

tanks to a fuel selector, to the gascolator, through a solid state 

check -valved free flow electronic fuel pump, through a fuel flow sensor, 

through the firewall, through a fuel filter, to the engine mechanical pump 

and then to the carburetor where it is metered to the engine intake 

manifolds.  The Bing Carburetor has incorporated the Fuel Economy 

Modification IAW Jabiru JSL002-1



3.   FUEL SYSTEM



A.     FUEL TANKS



B.      FUEL SELECTOR



C.      GASCOLATOR



D.      FUEL PUMPS



E.       APPROXIMATE FUEL BURN RATES at CRUISE



F.       FUEL TANK DIPSTICK READINGS



A.  FUEL TANKS



    N493TG has four 12-gallon fuel tanks, two in each wing.   The fuel 

filler is on the outer portion of the tanks and the wing dihedral forces 

fuel to the inner portion of the tank. Each tank has a VDO 10 - 180-ohm fuel 

gauge float type sender installed in the inboard cell of the tanks.  Each 

tank also has a standard fuel drain on the aft rear section of the tank for 

taking fuel samples and fuel draining.  Each tank contains approximately 1/4 

gallon of unusable fuel based on the position of the fuel pickups. The fuel 

caps latch should face aft when installed to prevent airflow from unlatching 

the cap in-flight.   The O-rings of the latches should be lubricated 

annually.



                                                                   WARNING



Static electricity can cause a fire when fueling or de-fueling if proper 

grounding procedures are not used.



B.  FUEL SELECTOR



    The fuel flows from each fuel tank to an ANDAIR  P/N FS20F8-F, five-way 

fuel selector on the center console.  The selector can select either RIGHT 

tank, LEFT tank, RIGHT AUX tank, LEFT AUX tank or OFF.  When selecting a 

fuel tank, ensure the selector is in the detent and a positive click is 

felt.



                                                                WARNING



Avoid switching fuel tanks at low altitude or just prior to takeoff in the 

event of a selector malfunction.



C.  GASCOLATOR



    After the fuel selector the fuel flows to the gascolater.  The 

gascolator has a fine screen for fuel filtering and a bowl to allow water to 

settle.  There is a quick drain on the bottom of the gascolator to allow 

taking fuel samples during preflight.  The gascolator is covered externally 

by an aerodynamic shaped  FOD guard to protect the gascolator from any 

foreign objects that may be tossed up by the nose wheel or prop.  This guard 

permits access to fuel sampling the gascolator during preflight and can be 

removed to allow removal of the gascolator bowl and screen filter during 

inspections.



WARNING



Ensure the gascolator drain is fully closed after taking a fuel sample. 

Failure to properly close the fuel drain can cause leakage causing fuel 

starvation.



D.  FUEL PUMPS



         A FACET P/N 40105, solid state, checked valved, electronic fuel 

pump is installed on the centerline of the cockpit floor just forward of the 

gascolator.  Another mechanical fuel pump is installed on the engine.  Prior 

to starting, the electronic fuel pump should be turned on for about 10 

seconds and then turned off.  The electronic fuel pump should be used for 

take off and landing and be OFF during cruise.

--------

 	  Quote: 	
		   Time: 10:08:03 PM PST US

 Subject: Bing carb on Jab3300

 From: "chris Sinfield" <chris_sinfield(at)yahoo.com.au>

 I found this on the Yahoo Jab Engine site any one had similar problems as

 the fuel

 pump that was sent with my XL kit was the 40105

 Chris..



 frm the site.....



 first engine start went well except that i had fuel leaks from the bing

 carb. i have a facet 40105 electric fuel pump that really overpowered

 the needle valve controlled by the floats. this is the pump i understand

 is used by many jab owners. after a short engine run without the elec.

 pump i shut the engine down as the manual pump was also causing fuel to

 leak. leaks were coming out the vent for the fuel bowl.

 i spoke to bing and was told that these needle assemblies come with

 several spring stiffnesses. i had the weakest spring assembly. bing is

 sending me the medium stiffness spring. bing said the stiffest spring is

 too stiff and not offered any more. bing said a pulolator pressure

 regulator is commonly installed in the fuel line. bing also said they

 get a lot of calls for the same problem from a lot of 40105 owners.

 maybe i should be looking at a facet pump of around 2-2.5 lbs. i believe

 they are made and would be more desireable because these lower pressured

 pumps have no check valves. thus no possible valve to stick.

 does anyone have anything to add to this or offer any fuel pressure

 info?

 and also, jim of pacific jabiru was helpful and patient with my phone

 calls as all of this was going on during the first start attempt.

 [Question]  [Question]

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 http://forums.matronics.com/viewtopic.php?p=93139#93139

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pete(at)usjabiru.com
Guest

Posted: Tue Feb 06, 2007 9:42 am Post subject: Bing carb on Jab3300

Actually the Car Quest pump has the blue label.  The pump itself has a Facet

Label on it and PSI from 1.5 to 3.5.



Pete



--

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