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Aux fuel pump

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n963wb(at)frontiernet.net
Guest

Posted: Thu Feb 23, 2006 4:20 pm Post subject: Aux fuel pump

Greetings



I installed a low pressure facet 40105 in series with the vacuum operated 

diaphragm pump on a Rotax 582.  The boost pump was operated on take off and 

landing only.  This set up has just over 100 hours on it and has not 

interfered with fuel flow when not in operation.  I plan to use the same set 

up on my 701 with Jabiru power plant.  Someone did bring up a valid point 

about first understanding the operation of the mechanical pump on the 

engine.  I am slated for engine delivery this month so will inspect the pump 

and, if necessary, even disassemble it to determine fuel flow and possible 

ramifications in the event of a failure.



Dick Neitzel

Sayner, WI

N962WB reserved

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ggower_99(at)yahoo.com
Guest

Posted: Thu Feb 23, 2006 10:27 pm Post subject: Aux fuel pump

I dont know the Jabiru gasoline pump (yet)  but the 912 Is a sealed pump...  similar to VW and Audi,  no way to open it...   

   

  About a not probable failure (broken) of the mechanical pump diaphgram...  Could the gasoline be pumped inside the oil carter by the electric pump?    In this case the engine will blow because of lack of oil?...  ("washed" out by gasoline in  a few minutes?)

   

  Just Murphy thinking...  Hope not possible.

   

  Saludos

  Gary Gower.



neitzel <n963wb(at)frontiernet.net> wrote:

  



Greetings



I installed a low pressure facet 40105 in series with the vacuum operated 

diaphragm pump on a Rotax 582. The boost pump was operated on take off and 

landing only. This set up has just over 100 hours on it and has not 

interfered with fuel flow when not in operation. I plan to use the same set 

up on my 701 with Jabiru power plant. Someone did bring up a valid point 

about first understanding the operation of the mechanical pump on the 

engine. I am slated for engine delivery this month so will inspect the pump 

and, if necessary, even disassemble it to determine fuel flow and possible 

ramifications in the event of a failure.



Dick Neitzel

Sayner, WI

N962WB reserved 



			

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frank.hinde(at)hp.com
Guest

Posted: Fri Feb 24, 2006 7:11 am Post subject: Aux fuel pump

Good for you...Most people kind of assume that because it works normally

it will protect them in the event of a failure...Not a good idea!



Frank



Do not archive 



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daberti(at)sbcglobal.net
Guest

Posted: Fri Feb 24, 2006 5:22 pm Post subject: Aux fuel pump

Although I have not checked the pump on my Rotax, most mechanical pumps will

leak through a small vent hole to the outside air if the diaphragm were to

get a hole.  On cars what you would get is the smell of gasoline after shut

down.  Sometimes a small witness line like you get with an oil leak.  I have

not experienced one that pumped so much gas into the oil that it caused a

problem.  I can't say the same from a faulty carb that leaked so much fuel

through a faulty power valve that I drained 6 quarts from the cars 4 quart

oil pan.  It would drain the bowl into the manifold when you shut off the

car.  That made it hard to start but once it ran it was fine.

  ""About a not probable failure (broken) of the mechanical pump

diaphgram...  Could the gasoline be pumped inside the oil carter by the

electric pump?    In this case the engine will blow because of lack of

oil?...  ("washed" out by gasoline in  a few minutes?)""

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