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Suitable place for electric fuel pump?

 
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PostPosted: Sat Nov 07, 2009 5:03 pm    Post subject: Suitable place for electric fuel pump? Reply with quote

Fellow Allegro listers,
 
Recently an electric fuel pump was installed in my Allegro 2000 (year 2001).
The pump is of make FACET-PUROLATOR and was placed in the motor compartment
on the bulkhead, close to where the fuel hose from the tank is fed through the
firewall forward. It seemed to be a "logical position" to the persons who did the job.
The electric pump is fitted parallel to the mechanical one.
 
The performance of the pump now appears to be too critical. Once, when the engine
was hot and the pump was activated before starting the engine, it kept "running dry" and
the fuel pressure gauge was not reacting at all.
  Reading the installation instructions I learned that the pump was placed too high
relative to the bottom of the fuel tank. The specification says: maximum 12 vertical inches.

So I think the position of the electric fuel pump must be changed.
 
I very much would like to know now: what is the, by the manufacturer prescribed, installation position for the electric fuel pump on the Allegro 2000. Does anyone have a photograph or a sketch available for me?  Thanks a lot for your reaction.
 
Theo van Duin (France)
Allegro 2000 (71MM) 
 
 
 
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Thom Riddle



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Location: Buffalo, NY, USA (9G0)

PostPosted: Sun Nov 08, 2009 5:02 am    Post subject: Re: Suitable place for electric fuel pump? Reply with quote

The factory installed the electric fuel pump in the central tunnel below the floor boards in the cabin. The silver colored cylindrical item in the attached photo is the factory supplied fuel pump. Note that this photo is from an Allegro that also has the optional fuel tanks in the wing which is the reason for the extra hoses, compared to those Allegros with only the belly tank. You will notice that this installation has the electric fuel pump in series with the mechanical pump instead of in parallel.

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PostPosted: Sun Nov 08, 2009 10:06 am    Post subject: Suitable place for electric fuel pump? Reply with quote

Thom, thank you for your comment. Do you think that installing the electric fuel pump
in series with the mechanical pump is considered to be much less reliable than installing it in parallel?
I never saw the inside construction of a mechanical pump. The only problem of an in-series installation could be, to my opinion, a blockage of the fuel flow due to a insidely  damaged mechanical pump.
 
Theo van Duin (France)
Allegro 2000 (71MM)
 
 
 
2009/11/8, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)>: [quote]--> Allegro-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>

The factory installed the electric fuel pump in the central tunnel below the floor boards in the cabin. The silver colored cylindrical item in the attached photo is the factory supplied fuel pump. Note that this photo is from an Allegro that also has the optional fuel tanks in the wing which is the reason for the extra hoses, compared to those Allegros with only the belly tank. You will notice that this installation has the electric fuel pump in series with the mechanical pump instead of in parallel.

--------
Thom Riddle
Buffalo, NY
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Thom Riddle



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PostPosted: Sun Nov 08, 2009 11:05 am    Post subject: Re: Suitable place for electric fuel pump? Reply with quote

Obviously, the series installation works and the flow from the electric pump does go through the mechanical pump when the engine is not running. However, my preference is to install the auxiliary pump in parallel. FYI, the mechanical pump is a simple diaphragm pump that is activated by a cam lobe on the propeller shaft. Inspection of this cam lobe and pump is an item on the annual inspection list and is very easy to do.

If you notice in the photo there is a line running along side of the electric fuel pump. This line contains a check valve I think. I no longer own an Allegro so I'm going by memory only. If the Facet pump is small enough and has a built in check valve to prevent back flow, then there might be room in this under-floor tunnel to install it in parallel with two fuel lines penetrating the firewall.


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aerosiam



Joined: 26 May 2008
Posts: 57

PostPosted: Sun Nov 08, 2009 6:35 pm    Post subject: Re: Fuel pump bulletin Reply with quote

Have you checked the Rotax service bulletin for the electric fuel pump? http://www.auf.asn.au/airworthiness/SB-912-053.pdf
On the subject of pumps, I was flying yesterday at 500 feet for 20 minutes and kept the electric pump on. The fuel pressure dropped to 0.3 bar. When I switched it off, it returned to a normal 0.4 bar.
Has anyone else had this?
Paul


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