AVSIG: R44 Raven II mechanical fuel pump wwswsigarch.jpg (7236 bytes)

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B. Butler (Oregonian)
Top Gun


Reged: 05/15/04
Posts: 9760
Loc: Ashland, Oregon
Re: R44 Raven II mechanical fuel pump [Re: Ray Tackett]
      #299254 - 09/21/10 12:24 PM

Quote:

I've got a couple thousand flight hours with dual (one electric, one
mechanical) fuel pumps. I have never had one fail, never mind two.




I have had the electric pump in my '67 Arrow fail once in 1200 hours (assuming it was original, had about 2800 hours on it at the time). I was at a remote location, swallowed hard and departed anyway.

Bill

--------------------
"Why not be a nihilist? A man has to believe in something."
-Bernie Gunther


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Evad Rellimhtug
Top Gun


Reged: 08/31/01
Posts: 2310
Re: R44 Raven II mechanical fuel pump [Re: B. Butler (Oregonian)]
      #299264 - 09/21/10 02:30 PM

Sometimes in the summer when it's real hot my RV6 will experience vapor lock with just the mechanical pump. The electric fuel pump is required to overcome that.

--------------------
Best,
Evad


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Terry Carraway
Top Gun


Reged: 06/02/04
Posts: 7098
Loc: Maryland
Re: R44 Raven II mechanical fuel pump [Re: Sean Franklin]
      #299359 - 09/22/10 04:23 PM

I thought of that later :)

--------------------
Terry
Mostly 0W3


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LouisC Grenierz
Public Guest


Reged: 05/15/04
Posts: 255
Loc: Quebec
Re: R44 Raven II mechanical fuel pump [Re: Anne Umphrey (KBED)]
      #299584 - 09/25/10 06:31 AM

Quote:

and during shutdown when you are disengaging the clutch.




Bingo !!

Thanks. A friend of mine was giving me a ride and the motor stopped at that point. The " it always does that" did not satisfy me.

At start-up, the electrical pump was left at priming position until the clutch switch was pushed (the motor was probably then working on the electrical pump)

Thanks for the explanation.

Lou


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