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Fuel pump - gascolator With ignorant Question

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4rcsimmons(at)comcast.net
Guest

Posted: Sat Nov 18, 2006 4:05 pm Post subject: Fuel pump - gascolator With ignorant Question

OK List,

  

 I spend more time reading than chiming in.

  

 I have noted the responses on the electric fuel pumps and the Colators.

  

 I have 2 questions with Comments.

  

 The Cherokees I have been flying have a 3rd place to check for fuel contamination located in front of the firewall at the lower cowl. It ensures no fuel conmination in the actual lines from last run.

  

 One

 Is this not a safe place to place the Colator? With the Jabiru engine is the Colator exposed to exsesive heat to create the dreaded Vapor Lock? Redundant but Wise??

  

 Two

 Is  the Electric Fuel pump not "just" backup? I am not sure of the fuel line routing but they should share feeding with the Mechanical pump. This measn the pump "always" unless under adverse situatins (Which shoud cause a no fligth with a check list) does not draw by istself the distance from the tank to the pump. (I think pump cooling is the biggest reason. That is why car mfg,s place them in the tank and that pump is the single/primary pump)

  

 Is it neccesary for the 2 pumps in the wings as have been discussed in recent listings?

  

 Just some thoughts would be appreciated.

  

  

 --

Thanks, 

Rich Simmons

 601 XL Last wing 60%

 Ordering fuselage components shortley

  [quote][b]

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p.mulwitz(at)worldnet.att
Guest

Posted: Sat Nov 18, 2006 4:46 pm Post subject: Fuel pump - gascolator With ignorant Question

Hi Rich,



 I also have flown Piper aircraft and others with low wing configuration.  They always had an electric fuel boost pump, but since I was just a dumb pilot I never figured out where the pump was located.



 I think the electric pump is needed on these planes to make starting easier.  The practice of starving the engine of fuel (with mixture cutoff) may leave a lot of work for the mechanical, engine driven, pump to do to get fuel flowing to the engine again.  It is standard procedure on all those planes to turn on the electric boost pump prior to starting the engine.  The boost pump is also started for takeoff and landing.  I guess it is optional for normal cruise.



 I have seen similar arrangements on high wing airplanes with fuel injection.  In that case, the electric pump makes starting possible by pressurizing the fuel system before engine cranking.



 I have never flown a plane with multiple electric pumps.  I have read many comments on this list suggesting they are needed to prevent vaporization of the fuel in the fuel lines.  However, it seems that only on this list is there concern about this issue.



 One question which might relate to the vapor question involves choice of fuel.  Avgas has additives to reduce its vapor pressure so it doesn't all evaporate at high altitude (during cruise).  Perhaps this is a more critical issue when using auto gas in your plane.



 Best regards,



 Paul

 XL fuselage



 

 At 04:04 PM 11/18/2006, you wrote:

 [quote]OK List,

  

 I spend more time reading than chiming in.

  

 I have noted the responses on the electric fuel pumps and the Colators.

  

 I have 2 questions with Comments.

  

 The Cherokees I have been flying have a 3rd place to check for fuel contamination located in front of the firewall at the lower cowl. It ensures no fuel conmination in the actual lines from last run.

  

 One

 Is this not a safe place to place the Colator? With the Jabiru engine is the Colator exposed to exsesive heat to create the dreaded Vapor Lock? Redundant but Wise??

  

 Two

 Is  the Electric Fuel pump not "just" backup? I am not sure of the fuel line routing but they should share feeding with the Mechanical pump. This measn the pump "always" unless under adverse situatins (Which shoud cause a no fligth with a check list) does not draw by istself the distance from the tank to the pump. (I think pump cooling is the biggest reason. That is why car mfg,s place them in the tank and that pump is the single/primary pump)

  

 Is it neccesary for the 2 pumps in the wings as have been discussed in recent listings?

  

 Just some thoughts would be appreciated.

  

  

 --

 Thanks, 

 Rich Simmons

 601 XL Last wing 60%

 Ordering fuselage components shortley

 

 [b]

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craig(at)craigandjean.com
Guest

Posted: Sat Nov 18, 2006 5:16 pm Post subject: Fuel pump - gascolator With ignorant Question

Re: gascolator FWF:

  

 In the typical William Wynne 601/Corvair installation the  gascolator goes at the base of the firewall on the engine side. See  www.flycorvair.com/hangar0605.html,  about 3/4s of the way down the page. William thinks that in a  crash the gascolator is less vulnerable here that in the standard position  ahead of the main spar. He says to think of the gascolator as a sink trap - it  doesn't have to be the lowest point in the entire system, just a "local  minimum".

  

 Most 601/Corvair builders don't think this  configuration is vulnerable to heat and vapor-lock. But if you are worried then  build a box around it and pipe cool air down through it. Look for a picture of  Dave's Wagabond at www.flycorvair.com/hangar1005.html, about a 1/5th of the  way down under "October 6, 2005"

  

 -- Craig



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   [quote][b]

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