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secondary fuel pump

 
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ejessee



Joined: 18 Apr 2009
Posts: 60
Location: Raleigh, NC
PostPosted: Wed Aug 26, 2009 5:51 pm    Post subject: secondary fuel pump Reply with quote
I have a 912 UL engine with only the engine fuel pump. I know that many 912's in other planes have electric pumps for cold-start and for obvious safety reasons. Has anyone put an electric secondary fuel pump on a 912 in a 701.

I am not sure how to plump it. As the engine pump uses suction, is it OK to pressurize the inlet side of that pump with a secondary pump. This would eliminate the need for a second fuel filter. I can also see away to plumb the secondary pump around the engine pump with check valves and a few tees. That very quickly becomes very complicated.

I know that a secondary pump isn't on most 701's. Seems like a good idea to me though.

thanks.

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Ernest Jessee
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PostPosted: Wed Aug 26, 2009 7:14 pm    Post subject: secondary fuel pump Reply with quote
Ernest,

I have mine right after the gasolator in series with the mechanical pump. Some will argue to put it in parallel, I suppose both works. If I was to do it over I would install a return line shown in the Rotax manual to help prevent any vapor lock.

Bob Spudis
N701ZX 912ULS/ 180Hrs




In a message dated 8/26/2009 9:52:39 P.M. Eastern Daylight Time, eejessee(at)us.ibm.com writes:
Quote:
I have a 912 UL engine with only the engine fuel pump. I know that many 912's in other planes have electric pumps for cold-start and for obvious safety reasons. Has anyone put an electric secondary fuel pump on a 912 in a 701.

I am not sure how to plump it. As the engine pump uses suction, is it OK to pressurize the inlet side of that pump with a secondary pump. This would eliminate the need for a second fuel filter.  I can also see away to plumb the secondary pump around the engine pump with check valves and a few tees. That very quickly becomes very complicated.

I know that a secondary pump isn't on most 701's.  Seems like a good idea to me though.

thanks.

--------
Ernest Jessee




[quote][b]

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