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  #1  
Old 10-13-2014, 12:59 PM
gear1 gear1 is offline
 
Join Date: Sep 2008
Location: Pagosa Springs CO
Posts: 266
Default Installation of new AF Perf fuel pump

After nearly 1800 hours of operation of our RV8, the original Airflow Performance boost pump has become increasingly noisy. It has finally gotten loud enough to cause concern, so rather than waiting for failure I decided to change the pump. The new pump is the Air Flow Performance #2090255, sold by Van's as "EF Airflow Fuel Pump-1." The new pump has vastly simplified the installation, as the bypass is internal to the assembly, eliminating the return line to a "T" at the fuel selector valve. The installation eliminated seven fittings and about 18" of fuel line. A very nice assembly! The photos show how neat it is:







The photos of the fuel filter are a bit confusing. The line comes out the bottom of the fuel selector valve, and curves around to the back of the filter.
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Craig Taylor
RV8 flying
2022 VAF dues paid with thanks
Navy A7E Vietnam era
Ret. Corporate Pilot: Gulfstream, IA Jet, Jetstar, Falcon 10, 20, 50, HS125

Last edited by gear1 : 10-13-2014 at 01:05 PM. Reason: to properly insert photos
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  #2  
Old 10-13-2014, 01:11 PM
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RV7AJeremy RV7AJeremy is offline
 
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Location: Gilbert AZ
Posts: 416
Default Parallel Thread

Sort of a parallel thread going on at the same time:
http://www.vansairforce.com/communit...d.php?t=118171
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  #3  
Old 10-13-2014, 01:13 PM
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Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Default

Other than the fuel lines, is there anything supporting the weight (mass) of the filter??

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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

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  #4  
Old 10-13-2014, 01:56 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,825
Default

Quote:
Originally Posted by Mike S View Post
Other than the fuel lines, is there anything supporting the weight (mass) of the filter??

Exactly my thought. I saw a similar setup in another 8, only with longer fuel lines on each end with the filter suspended by the hard aluminum lines and pointed out my concern to the builder. He did not seem to have much concern about it though.
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  #5  
Old 10-13-2014, 02:28 PM
gear1 gear1 is offline
 
Join Date: Sep 2008
Location: Pagosa Springs CO
Posts: 266
Thumbs up Filter support

Good eye, Mike and Mehrdad,

I did not put in place the soft rubber cradles that will be used to support and damp the vibration of the filter. The cradles will support each end of the filter.

As I was removing the original plumbing for the pump, I discovered that the aft end of filter was rigidly attached (through several fittings) to the fuel selector valve, and flexibly at the front by the aluminum pipe going through the grommet in the gear tower. To me that was asking for fatigue problems at the fittings, although 1800 airframe hours seems to have shown that it works! Now, all of the lines are formed to be long enough to have a bit of flex to fend off vibration without overstress. The rubber cradles will provide the support and damping needed to protect the lines, and can be slipped out to allow for the filter to be removed at condition inspection time.

Thanks for the good observation!
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RV8 flying
2022 VAF dues paid with thanks
Navy A7E Vietnam era
Ret. Corporate Pilot: Gulfstream, IA Jet, Jetstar, Falcon 10, 20, 50, HS125
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  #6  
Old 10-13-2014, 05:42 PM
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chazking chazking is offline
 
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Posts: 396
Default Experimenting?

We're you experimenting before "finalizing" the configuration? Better to see how it works than to re-do it later!
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