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Jab 3300 Fuel Pump

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JAPhillipsGA(at)aol.com
Guest

Posted: Wed Jun 20, 2007 8:44 am Post subject: Jab 3300 Fuel Pump

Dear Jab 3300 Flyers,  show of hands. How many use the elec fuel pump on run up ? How many use the elec fuel pump on take off ? And again in the pattern for landing ? Hope to hear from you guys and best regards, Bill of Georgia

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 See what's free at http://www.aol.com.  [quote][b]

rpf(at)wi.rr.com
Guest

Posted: Wed Jun 20, 2007 10:15 am Post subject: Jab 3300 Fuel Pump

Hi Bill,

  

 I fly a 601xl and turn my elec. fuel pump on for about 10  seconds before starting the engine.  Turn the pump off start the engine and  it's not used again during flight or landing.  This is what Pete, at Jabiru  USA, said they do.

  

 Randy

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tonyplane(at)bellsouth.ne
Guest

Posted: Wed Jun 20, 2007 10:29 am Post subject: Jab 3300 Fuel Pump

Very seldom* use electric fuel  pump on take off although I put it in my checklist to use on take  off and landing.  Same for Landing. (It  causes my fuel flow turbine to read too high - I placed the fuel flow turbine  too close to the elec pump.)  

 I do use the electric pump for 10 seconds before  start. I do not use it for run-up

  

 *If the runway is short, I DO use the electric pump  for take off and landing.

  

 Tony Graziano

 XL/Jab3300; N493TG 252 fun hrs with the XL-  and never had a carb or start problem or concern.

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             Subject:      Jab 3300 Fuel        Pump                	  Quote: 	
		   	  Quote: 	
		   	
	
        From:              JAPhillipsGA(at)aol.com ([email]JAPhillipsGA(at)aol.com?subject=Re:%20Jab%203300%20Fuel%20Pump&replyto=d1a.cda2a31.33aab319(at)aol.com[/email])        Date:              Wed Jun 20 - 9:44        AM

  	  Quote: 	
		   	  Quote: 	
		  Dear Jab 3300 Flyers,  show of hands. How many use the elec fuel pump on run 

up ? How many use the elec fuel pump on take off ? And again in the pattern 

for landing ? Hope to hear from you guys and best regards, Bill of Georgia



	
	
   [quote][b]

rick.tedford(at)sympatico
Guest

Posted: Wed Jun 20, 2007 12:41 pm Post subject: Jab 3300 Fuel Pump

Hello Bill : The only time I use the electric pump  is to prime the system before start up . I don't think putting the pump into the  system before the gascolator is  good as it would pressurise same and those  can leak quite easily . Naturally it is there as a back up in the event the pump  on the engine fails . 

 Best Regards

 Rick Tedford

 601XL , Jab 3300

 C-FRTT , 250 hours 

 [quote]   ---

zodiacjeff(at)msn.com
Guest

Posted: Wed Jun 20, 2007 12:56 pm Post subject: Jab 3300 Fuel Pump

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> >I fly a 601xl and turn my elec. fuel pump on for about 10 seconds  before 

 	  Quote: 	
		  starting the engine.  Turn the pump off start the engine and  it's not 

used again during flight or landing.  This is what Pete,  at Jabiru USA, 

said they do.


	


 Ditto - with the addition that here it's an HDS with wing tanks feeding  into a common gascolator in front of spar and then onto header tank via  Facet.  This is the old Brent Battles' design from ancient days.

  

 I use the Facet between the firewall gascolator (in series) and the  mechanical Jab pump only to prime engine.

  

 do not archive



   [quote][b]

Tim Juhl

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

Posted: Wed Jun 20, 2007 4:46 pm Post subject: Re: Jab 3300 Fuel Pump

Regarding the comment: "This is what Pete, at Jabiru USA, said they do. "



Was Pete talking about a Jabiru 3300 in a Jabiru aircraft (high wing) or a low wing?  Big difference!



As I recall, SOP in most low wing aircraft is electric fuel pump on before engine start thru takeoff and climb to a safe altitude - also when switching tanks and when landing.  There is a point in the pre takeoff checklist where the electric pump is switched off to see if the engine keeps running.  



If your engine driven fuel pump failed on takeoff and your electric pump was not on, bad things could happen very quickly.  Unless someone can give me a good reason to do otherwise, my pump will be on.



Note:  When choosing a fuel pump for the Jab remember that you don't want the fuel pressure to get too high (around 3-3.5 psi max.)  The pump that comes with the Zenith Kit puts out more than that so I replaced it with a  Facet 40104.



Tim

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

rpf(at)wi.rr.com
Guest

Posted: Wed Jun 20, 2007 6:26 pm Post subject: Jab 3300 Fuel Pump

He said it was on a low wing.



Fine, do what you want.  I just stated what I do.



---

Tim Juhl

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

Posted: Thu Jun 21, 2007 6:33 am Post subject: Re: Jab 3300 Fuel Pump

Randy,

I wasn't being critical.  I've met Pete a few times and took the "Jab install in a Zodiac" class at his place in Shelbyville.  He never commented about when to use the fuel pump and in retrospect I should have asked.  He did warn about using fuel pumps that put out too much pressure.  Your comment is very helpful in that I am going to find out from Pete what his logic is behind the procedure he recommends.



The low wing Pete sells is the Lightning.... I can't tell you how it's fuel system design compares to the XL.



In my 32 years of flying I've had 3 in-flight engine emergencies that required immediate landings.  Fortunately each one was at altitude and an airport was nearby.   My biggest fear would be power loss shortly after liftoff so you can understand my concern.  All the other aircraft I've owned have been high wing and didn't even have a electric fuel pump so the XL will be something new for me.  My experience with low wing aircraft is restricted to aircraft I have trained in and flown while giving flight instruction, mostly Piper and Beech products.



Tim

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

rpf(at)wi.rr.com
Guest

Posted: Thu Jun 21, 2007 1:18 pm Post subject: Jab 3300 Fuel Pump

Sorry for being short with you Tim, bad day.



Prior the my 601xl I built a Skyranger with a 912s.  It was a high wing but 

the fuel tank was located behind the seats essentially making the fuel run 

up to the engines mechanical pump.  The fuel system was similar to the xl 

with a elec. pump between the fuel tank and the mechanical pump.  As with 

the xl I used the electric pump  just prior to start up and the mechanical 

pump after that.  I had almost 400 hours on that plane and never had a fuel 

delivery problem.



Randy

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japhillipsga(at)aol.com
Guest

Posted: Tue Jun 26, 2007 8:28 am Post subject: Jab 3300 Fuel Pump

Randy, that's the same thing he told me, thanks, Bill

 

 

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japhillipsga(at)aol.com
Guest

Posted: Tue Jun 26, 2007 8:28 am Post subject: Jab 3300 Fuel Pump

Tony, I do the same, thanks for the info. Bill 



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japhillipsga(at)aol.com
Guest

Posted: Tue Jun 26, 2007 8:29 am Post subject: Jab 3300 Fuel Pump

Rick, I do the same thing for the same reason, Thanks for the info, Bill 

 

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